fix(output): prevent CSV formula injection#31

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fix(output): prevent CSV formula injection #31

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f89c483
fix(output): prevent CVS formula injection
zoya-brd Aug 31, 2026
cacd7ea
fix(output): improve CVS sanitization config
zoya-brd Sep 1, 2026
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51 changes: 50 additions & 1 deletion src/__tests__/utils/output.test.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -2,9 +2,22 @@ import {describe, it, expect, vi, beforeEach, afterEach} from 'vitest';
import fs from 'fs';
import path from 'path';
import os from 'os';
import {serialize, format_from_ext, print} from '../../utils/output';

const mocks = vi.hoisted(()=>({
get_config: vi.fn(),
}));
vi.mock('../../utils/config', ()=>({
get: mocks.get_config,
}));

import {serialize, format_from_ext, print} from '../../utils/output';
describe('utils/output.serialize csv', ()=>{
beforeEach(()=>{
mocks.get_config.mockReturnValue(true);
});
afterEach(()=>{
mocks.get_config.mockReset();
});
it('serializes array of flat objects as RFC 4180 CSV with header row', ()=>{
const rows = [
{url: 'https://a.test/1', title: 'A', price: 1.5},
Expand DownExpand Up@@ -46,6 +59,42 @@ describe('utils/output.serialize csv', ()=>{
const lines = out.trim().split('\n');
expect(lines[1]).toBe('1,"{""tag"":""x""}"');
});
it('sanitizes spreadsheet formula prefixes in CSV string cells', ()=>{
const rows = [{
equals: '=1+1',
space: ' =1+1',
multi_space: ' =1+1',
tab: '\t=1+1',
nbsp: '\u00a0=1+1',
plus: '+cmd',
minus: '-SUM(A1:A2)',
at: '@SUM(A1:A2)',
}];
const out = serialize(rows, 'csv');
expect(out).toContain("'=1+1");
expect(out).toContain("' =1+1");
expect(out).toContain("' =1+1");
expect(out).toContain("'\t=1+1");
expect(out).toContain("'\u00a0=1+1");
expect(out).toContain("'+cmd");
expect(out).toContain("'-SUM(A1:A2)");
expect(out).toContain("'@SUM(A1:A2)");
});
it('does not sanitize numeric values', ()=>{
const out = serialize([{value: -100}], 'csv');
const lines = out.trim().split('\n');
expect(lines[1]).toBe('-100');
});
it('preserves numeric-looking CSV strings', ()=>{
const out = serialize([{negative: '-100', positive: '+15'}], 'csv');
expect(out).toContain('-100,+15');
});
it('does not sanitize CSV cells when sanitize_csv is false', ()=>{
mocks.get_config.mockReturnValue(false);
const out = serialize([{value: '=1+1'}], 'csv');
expect(out).toContain('=1+1');
expect(out).not.toContain("'=1+1");
});
});

describe('utils/output.serialize markdown', ()=>{
Expand Down
15 changes: 13 additions & 2 deletions src/commands/config.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -14,6 +14,7 @@ const CONFIG_KEYS: Config_key[] = [
'default_zone_serp',
'default_format',
'api_url',
'sanitize_csv',
];

const format_keys = ()=>CONFIG_KEYS.join(', ');
Expand DownExpand Up@@ -50,12 +51,22 @@ const handle_get_config = (key: string)=>{
);
return;
}
process.stdout.write(value+'\n');
process.stdout.write(String(value)+'\n');
};

const handle_set_config = (key: string, value: string)=>{
const valid_key = ensure_valid_key(key);
set_config(valid_key, value);
if (valid_key == 'sanitize_csv')
{
if (value != 'true' && value != 'false')
{
fail('sanitize_csv must be true or false');
return;
}
set_config(valid_key, value == 'true');
}
else
set_config(valid_key, value);
success(`Config updated: ${valid_key}=${value}`);
};

Expand Down
12 changes: 9 additions & 3 deletions src/utils/config.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -9,11 +9,17 @@ type Config = {
default_zone_serp?: string;
default_format?: string;
api_url?: string;
sanitize_csv?: boolean;
};

type String_config_key = {
[K in keyof Config]-?: Config[K] extends string|undefined ? K : never
}[keyof Config];

const DEFAULTS: Config = {
default_format: 'markdown',
api_url: 'https://api.brightdata.com',
sanitize_csv: true,
};

const load = (): Config=>{
Expand All@@ -35,12 +41,12 @@ const save = (config: Config)=>{
fs.writeFileSync(get_config_path(), JSON.stringify(config, null, 4));
};

const get = (key: keyof Config): string|undefined=>{
const get = <K extends keyof Config>(key: K): Config[K]=>{
const config = load();
return config[key];
};

const set = (key: keyof Config, value: string)=>{
const set = <K extends keyof Config>(key: K, value: Config[K])=>{
const config = load();
config[key] = value;
save(config);
Expand All@@ -50,7 +56,7 @@ const set = (key: keyof Config, value: string)=>{
const resolve = (
cli_val: string|undefined,
env_key: string,
config_key: keyof Config
config_key: String_config_key
): string|undefined=>{
if (cli_val)
return cli_val;
Expand Down
17 changes: 15 additions & 2 deletions src/utils/output.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
@@ -1,6 +1,8 @@
import fs from 'fs';
import path from 'path';

import {get as get_config} from './config';

const is_tty = process.stdout.isTTY === true;

const ansi = (code: string, text: string)=>
Expand DownExpand Up@@ -84,10 +86,21 @@ const cell_to_string = (val: unknown): string=>{
return JSON.stringify(val);
};

const sanitize_csv_cell = (s: string): string=>{

@artemo-brdartemo-brdAug 31, 2026•
edited
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Please add a global sanitize_csv configuration option that users can set with:

brightdata config set sanitize_csv false
brightdata config set sanitize_csv true

It should default to true. Since config values currently enter through the CLI as strings, please validate and convert "true"/"false" to actual booleans when setting or reading this option; "false" must not be treated as a truthy string. Other values should be rejected.

We can add per-command overrides later if needed (scrape, search, pipelines, discover, scraper, browser),

const trimmed = s.trim();
if (/^[+-]?(?:\d+(?:\.\d+)?|\.\d+)$/.test(trimmed))
return s;
if (/^[\s\u00a0]*[=+\-@]/.test(s))
return "'" + s;
return s;
};

const csv_escape = (val: unknown): string=>{
const s = cell_to_string(val);
let s = cell_to_string(val);
if (typeof val == 'string' && get_config('sanitize_csv') !== false)
s = sanitize_csv_cell(s);
if (/[",\r\n]/.test(s))
return '"'+s.replace(/"/g, '""')+'"';
return '"' + s.replace(/"/g, '""') + '"';
return s;
};

Expand Down
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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fix(output): prevent CSV formula injection#31

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 Open

zoya-brd
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2
commits into

base:main
Choose a base branch

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fix(output): prevent CSV formula injection
#31
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f89c483

fix(output): prevent CVS formula injection


zoya-brd Aug 31, 2026
cacd7ea

fix(output): improve CVS sanitization config


zoya-brd Sep 1, 2026

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51 changes: 50 additions & 1 deletion
src/__tests__/utils/output.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,9 +2,22 @@ import {describe, it, expect, vi, beforeEach, afterEach} from 'vitest';
import fs from 'fs';
import path from 'path';
import os from 'os';
import {serialize, format_from_ext, print} from '../../utils/output';

const mocks = vi.hoisted(()=>({
 get_config: vi.fn(),
}));
vi.mock('../../utils/config', ()=>({
 get: mocks.get_config,
}));

import {serialize, format_from_ext, print} from '../../utils/output';
describe('utils/output.serialize csv', ()=>{
 beforeEach(()=>{
 mocks.get_config.mockReturnValue(true);
 });
 afterEach(()=>{
 mocks.get_config.mockReset();
 });
 it('serializes array of flat objects as RFC 4180 CSV with header row', ()=>{
 const rows = [
 {url: 'https://a.test/1', title: 'A', price: 1.5},
Expand DownExpand Up@@ -46,6 +59,42 @@ describe('utils/output.serialize csv', ()=>{
 const lines = out.trim().split('\n');
 expect(lines[1]).toBe('1,"{""tag"":""x""}"');
 });
 it('sanitizes spreadsheet formula prefixes in CSV string cells', ()=>{
 const rows = [{
 equals: '=1+1',
 space: ' =1+1',
 multi_space: ' =1+1',
 tab: '\t=1+1',
 nbsp: '\u00a0=1+1',
 plus: '+cmd',
 minus: '-SUM(A1:A2)',
 at: '@SUM(A1:A2)',
 }];
 const out = serialize(rows, 'csv');
 expect(out).toContain("'=1+1");
 expect(out).toContain("' =1+1");
 expect(out).toContain("' =1+1");
 expect(out).toContain("'\t=1+1");
 expect(out).toContain("'\u00a0=1+1");
 expect(out).toContain("'+cmd");
 expect(out).toContain("'-SUM(A1:A2)");
 expect(out).toContain("'@SUM(A1:A2)");
 });
 it('does not sanitize numeric values', ()=>{
 const out = serialize([{value: -100}], 'csv');
 const lines = out.trim().split('\n');
 expect(lines[1]).toBe('-100');
 });
 it('preserves numeric-looking CSV strings', ()=>{
 const out = serialize([{negative: '-100', positive: '+15'}], 'csv');
 expect(out).toContain('-100,+15');
 });
 it('does not sanitize CSV cells when sanitize_csv is false', ()=>{
 mocks.get_config.mockReturnValue(false);
 const out = serialize([{value: '=1+1'}], 'csv');
 expect(out).toContain('=1+1');
 expect(out).not.toContain("'=1+1");
 });
});

describe('utils/output.serialize markdown', ()=>{
Expand Down

15 changes: 13 additions & 2 deletions
src/commands/config.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -14,6 +14,7 @@ const CONFIG_KEYS: Config_key[] = [
 'default_zone_serp',
 'default_format',
 'api_url',
 'sanitize_csv',
];

const format_keys = ()=>CONFIG_KEYS.join(', ');
Expand DownExpand Up@@ -50,12 +51,22 @@ const handle_get_config = (key: string)=>{
 );
 return;
 }
 process.stdout.write(value+'\n');
 process.stdout.write(String(value)+'\n');
};

const handle_set_config = (key: string, value: string)=>{
 const valid_key = ensure_valid_key(key);
 set_config(valid_key, value);
 if (valid_key == 'sanitize_csv')
 {
 if (value != 'true' && value != 'false')
 {
 fail('sanitize_csv must be true or false');
 return;
 }
 set_config(valid_key, value == 'true');
 }
 else
 set_config(valid_key, value);
 success(`Config updated: ${valid_key}=${value}`);
};

Expand Down

12 changes: 9 additions & 3 deletions
src/utils/config.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -9,11 +9,17 @@ type Config = {
 default_zone_serp?: string;
 default_format?: string;
 api_url?: string;
 sanitize_csv?: boolean;
};

type String_config_key = {
 [K in keyof Config]-?: Config[K] extends string|undefined ? K : never
}[keyof Config];

const DEFAULTS: Config = {
 default_format: 'markdown',
 api_url: 'https://api.brightdata.com',
 sanitize_csv: true,
};

const load = (): Config=>{
Expand All@@ -35,12 +41,12 @@ const save = (config: Config)=>{
 fs.writeFileSync(get_config_path(), JSON.stringify(config, null, 4));
};

const get = (key: keyof Config): string|undefined=>{
const get = <K extends keyof Config>(key: K): Config[K]=>{
 const config = load();
 return config[key];
};

const set = (key: keyof Config, value: string)=>{
const set = <K extends keyof Config>(key: K, value: Config[K])=>{
 const config = load();
 config[key] = value;
 save(config);
Expand All@@ -50,7 +56,7 @@ const set = (key: keyof Config, value: string)=>{
const resolve = (
 cli_val: string|undefined,
 env_key: string,
 config_key: keyof Config
 config_key: String_config_key
): string|undefined=>{
 if (cli_val)
 return cli_val;
Expand Down

17 changes: 15 additions & 2 deletions
src/utils/output.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,8 @@
import fs from 'fs';
import path from 'path';

import {get as get_config} from './config';

const is_tty = process.stdout.isTTY === true;

const ansi = (code: string, text: string)=>
Expand DownExpand Up@@ -84,10 +86,21 @@ const cell_to_string = (val: unknown): string=>{
 return JSON.stringify(val);
};

const sanitize_csv_cell = (s: string): string=>{
@artemo-brdartemo-brdAug 31, 2026•

edited

Loading

Copy link


Copy Markdown

Contributor
Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Please add a global sanitize_csv configuration option that users can set with:
brightdata config set sanitize_csv false
brightdata config set sanitize_csv true

It should default to true. Since config values currently enter through the CLI as strings, please validate and convert "true"/"false" to actual booleans when setting or reading this option; "false" must not be treated as a truthy string. Other values should be rejected.
We can add per-command overrides later if needed (scrape, search, pipelines, discover, scraper, browser),
 const trimmed = s.trim();
 if (/^[+-]?(?:\d+(?:\.\d+)?|\.\d+)$/.test(trimmed))
 return s;
 if (/^[\s\u00a0]*[=+\-@]/.test(s))
 return "'" + s;
 return s;
};

const csv_escape = (val: unknown): string=>{
 const s = cell_to_string(val);
 let s = cell_to_string(val);
 if (typeof val == 'string' && get_config('sanitize_csv') !== false)
 s = sanitize_csv_cell(s);
 if (/[",\r\n]/.test(s))
 return '"'+s.replace(/"/g, '""')+'"';
 return '"' + s.replace(/"/g, '""') + '"';
 return s;
};

Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
fix(output): prevent CSV formula injection#31

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privacy statement. We’ll occasionally send you account related emails.

Already on GitHub?
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to your account

 Open

zoya-brd
wants to merge
2
commits into

base:main
Choose a base branch

from


+87

−8

 Open


fix(output): prevent CSV formula injection
#31
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f89c483

fix(output): prevent CVS formula injection


zoya-brd Aug 31, 2026
cacd7ea

fix(output): improve CVS sanitization config


zoya-brd Sep 1, 2026

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51 changes: 50 additions & 1 deletion
src/__tests__/utils/output.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,9 +2,22 @@ import {describe, it, expect, vi, beforeEach, afterEach} from 'vitest';
import fs from 'fs';
import path from 'path';
import os from 'os';
import {serialize, format_from_ext, print} from '../../utils/output';

const mocks = vi.hoisted(()=>({
 get_config: vi.fn(),
}));
vi.mock('../../utils/config', ()=>({
 get: mocks.get_config,
}));

import {serialize, format_from_ext, print} from '../../utils/output';
describe('utils/output.serialize csv', ()=>{
 beforeEach(()=>{
 mocks.get_config.mockReturnValue(true);
 });
 afterEach(()=>{
 mocks.get_config.mockReset();
 });
 it('serializes array of flat objects as RFC 4180 CSV with header row', ()=>{
 const rows = [
 {url: 'https://a.test/1', title: 'A', price: 1.5},
Expand DownExpand Up@@ -46,6 +59,42 @@ describe('utils/output.serialize csv', ()=>{
 const lines = out.trim().split('\n');
 expect(lines[1]).toBe('1,"{""tag"":""x""}"');
 });
 it('sanitizes spreadsheet formula prefixes in CSV string cells', ()=>{
 const rows = [{
 equals: '=1+1',
 space: ' =1+1',
 multi_space: ' =1+1',
 tab: '\t=1+1',
 nbsp: '\u00a0=1+1',
 plus: '+cmd',
 minus: '-SUM(A1:A2)',
 at: '@SUM(A1:A2)',
 }];
 const out = serialize(rows, 'csv');
 expect(out).toContain("'=1+1");
 expect(out).toContain("' =1+1");
 expect(out).toContain("' =1+1");
 expect(out).toContain("'\t=1+1");
 expect(out).toContain("'\u00a0=1+1");
 expect(out).toContain("'+cmd");
 expect(out).toContain("'-SUM(A1:A2)");
 expect(out).toContain("'@SUM(A1:A2)");
 });
 it('does not sanitize numeric values', ()=>{
 const out = serialize([{value: -100}], 'csv');
 const lines = out.trim().split('\n');
 expect(lines[1]).toBe('-100');
 });
 it('preserves numeric-looking CSV strings', ()=>{
 const out = serialize([{negative: '-100', positive: '+15'}], 'csv');
 expect(out).toContain('-100,+15');
 });
 it('does not sanitize CSV cells when sanitize_csv is false', ()=>{
 mocks.get_config.mockReturnValue(false);
 const out = serialize([{value: '=1+1'}], 'csv');
 expect(out).toContain('=1+1');
 expect(out).not.toContain("'=1+1");
 });
});

describe('utils/output.serialize markdown', ()=>{
Expand Down

15 changes: 13 additions & 2 deletions
src/commands/config.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -14,6 +14,7 @@ const CONFIG_KEYS: Config_key[] = [
 'default_zone_serp',
 'default_format',
 'api_url',
 'sanitize_csv',
];

const format_keys = ()=>CONFIG_KEYS.join(', ');
Expand DownExpand Up@@ -50,12 +51,22 @@ const handle_get_config = (key: string)=>{
 );
 return;
 }
 process.stdout.write(value+'\n');
 process.stdout.write(String(value)+'\n');
};

const handle_set_config = (key: string, value: string)=>{
 const valid_key = ensure_valid_key(key);
 set_config(valid_key, value);
 if (valid_key == 'sanitize_csv')
 {
 if (value != 'true' && value != 'false')
 {
 fail('sanitize_csv must be true or false');
 return;
 }
 set_config(valid_key, value == 'true');
 }
 else
 set_config(valid_key, value);
 success(`Config updated: ${valid_key}=${value}`);
};

Expand Down

12 changes: 9 additions & 3 deletions
src/utils/config.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -9,11 +9,17 @@ type Config = {
 default_zone_serp?: string;
 default_format?: string;
 api_url?: string;
 sanitize_csv?: boolean;
};

type String_config_key = {
 [K in keyof Config]-?: Config[K] extends string|undefined ? K : never
}[keyof Config];

const DEFAULTS: Config = {
 default_format: 'markdown',
 api_url: 'https://api.brightdata.com',
 sanitize_csv: true,
};

const load = (): Config=>{
Expand All@@ -35,12 +41,12 @@ const save = (config: Config)=>{
 fs.writeFileSync(get_config_path(), JSON.stringify(config, null, 4));
};

const get = (key: keyof Config): string|undefined=>{
const get = <K extends keyof Config>(key: K): Config[K]=>{
 const config = load();
 return config[key];
};

const set = (key: keyof Config, value: string)=>{
const set = <K extends keyof Config>(key: K, value: Config[K])=>{
 const config = load();
 config[key] = value;
 save(config);
Expand All@@ -50,7 +56,7 @@ const set = (key: keyof Config, value: string)=>{
const resolve = (
 cli_val: string|undefined,
 env_key: string,
 config_key: keyof Config
 config_key: String_config_key
): string|undefined=>{
 if (cli_val)
 return cli_val;
Expand Down

17 changes: 15 additions & 2 deletions
src/utils/output.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,8 @@
import fs from 'fs';
import path from 'path';

import {get as get_config} from './config';

const is_tty = process.stdout.isTTY === true;

const ansi = (code: string, text: string)=>
Expand DownExpand Up@@ -84,10 +86,21 @@ const cell_to_string = (val: unknown): string=>{
 return JSON.stringify(val);
};

const sanitize_csv_cell = (s: string): string=>{
@artemo-brdartemo-brdAug 31, 2026•

edited

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Please add a global sanitize_csv configuration option that users can set with:
brightdata config set sanitize_csv false
brightdata config set sanitize_csv true

It should default to true. Since config values currently enter through the CLI as strings, please validate and convert "true"/"false" to actual booleans when setting or reading this option; "false" must not be treated as a truthy string. Other values should be rejected.
We can add per-command overrides later if needed (scrape, search, pipelines, discover, scraper, browser),
 const trimmed = s.trim();
 if (/^[+-]?(?:\d+(?:\.\d+)?|\.\d+)$/.test(trimmed))
 return s;
 if (/^[\s\u00a0]*[=+\-@]/.test(s))
 return "'" + s;
 return s;
};

const csv_escape = (val: unknown): string=>{
 const s = cell_to_string(val);
 let s = cell_to_string(val);
 if (typeof val == 'string' && get_config('sanitize_csv') !== false)
 s = sanitize_csv_cell(s);
 if (/[",\r\n]/.test(s))
 return '"'+s.replace(/"/g, '""')+'"';
 return '"' + s.replace(/"/g, '""') + '"';
 return s;
};

Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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fix(output): prevent CSV formula injection#31

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fix(output): prevent CSV formula injection
#31
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f89c483

fix(output): prevent CVS formula injection


zoya-brd Aug 31, 2026
cacd7ea

fix(output): improve CVS sanitization config


zoya-brd Sep 1, 2026

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51 changes: 50 additions & 1 deletion
src/__tests__/utils/output.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,9 +2,22 @@ import {describe, it, expect, vi, beforeEach, afterEach} from 'vitest';
import fs from 'fs';
import path from 'path';
import os from 'os';
import {serialize, format_from_ext, print} from '../../utils/output';

const mocks = vi.hoisted(()=>({
 get_config: vi.fn(),
}));
vi.mock('../../utils/config', ()=>({
 get: mocks.get_config,
}));

import {serialize, format_from_ext, print} from '../../utils/output';
describe('utils/output.serialize csv', ()=>{
 beforeEach(()=>{
 mocks.get_config.mockReturnValue(true);
 });
 afterEach(()=>{
 mocks.get_config.mockReset();
 });
 it('serializes array of flat objects as RFC 4180 CSV with header row', ()=>{
 const rows = [
 {url: 'https://a.test/1', title: 'A', price: 1.5},
Expand DownExpand Up@@ -46,6 +59,42 @@ describe('utils/output.serialize csv', ()=>{
 const lines = out.trim().split('\n');
 expect(lines[1]).toBe('1,"{""tag"":""x""}"');
 });
 it('sanitizes spreadsheet formula prefixes in CSV string cells', ()=>{
 const rows = [{
 equals: '=1+1',
 space: ' =1+1',
 multi_space: ' =1+1',
 tab: '\t=1+1',
 nbsp: '\u00a0=1+1',
 plus: '+cmd',
 minus: '-SUM(A1:A2)',
 at: '@SUM(A1:A2)',
 }];
 const out = serialize(rows, 'csv');
 expect(out).toContain("'=1+1");
 expect(out).toContain("' =1+1");
 expect(out).toContain("' =1+1");
 expect(out).toContain("'\t=1+1");
 expect(out).toContain("'\u00a0=1+1");
 expect(out).toContain("'+cmd");
 expect(out).toContain("'-SUM(A1:A2)");
 expect(out).toContain("'@SUM(A1:A2)");
 });
 it('does not sanitize numeric values', ()=>{
 const out = serialize([{value: -100}], 'csv');
 const lines = out.trim().split('\n');
 expect(lines[1]).toBe('-100');
 });
 it('preserves numeric-looking CSV strings', ()=>{
 const out = serialize([{negative: '-100', positive: '+15'}], 'csv');
 expect(out).toContain('-100,+15');
 });
 it('does not sanitize CSV cells when sanitize_csv is false', ()=>{
 mocks.get_config.mockReturnValue(false);
 const out = serialize([{value: '=1+1'}], 'csv');
 expect(out).toContain('=1+1');
 expect(out).not.toContain("'=1+1");
 });
});

describe('utils/output.serialize markdown', ()=>{
Expand Down

15 changes: 13 additions & 2 deletions
src/commands/config.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -14,6 +14,7 @@ const CONFIG_KEYS: Config_key[] = [
 'default_zone_serp',
 'default_format',
 'api_url',
 'sanitize_csv',
];

const format_keys = ()=>CONFIG_KEYS.join(', ');
Expand DownExpand Up@@ -50,12 +51,22 @@ const handle_get_config = (key: string)=>{
 );
 return;
 }
 process.stdout.write(value+'\n');
 process.stdout.write(String(value)+'\n');
};

const handle_set_config = (key: string, value: string)=>{
 const valid_key = ensure_valid_key(key);
 set_config(valid_key, value);
 if (valid_key == 'sanitize_csv')
 {
 if (value != 'true' && value != 'false')
 {
 fail('sanitize_csv must be true or false');
 return;
 }
 set_config(valid_key, value == 'true');
 }
 else
 set_config(valid_key, value);
 success(`Config updated: ${valid_key}=${value}`);
};

Expand Down

12 changes: 9 additions & 3 deletions
src/utils/config.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -9,11 +9,17 @@ type Config = {
 default_zone_serp?: string;
 default_format?: string;
 api_url?: string;
 sanitize_csv?: boolean;
};

type String_config_key = {
 [K in keyof Config]-?: Config[K] extends string|undefined ? K : never
}[keyof Config];

const DEFAULTS: Config = {
 default_format: 'markdown',
 api_url: 'https://api.brightdata.com',
 sanitize_csv: true,
};

const load = (): Config=>{
Expand All@@ -35,12 +41,12 @@ const save = (config: Config)=>{
 fs.writeFileSync(get_config_path(), JSON.stringify(config, null, 4));
};

const get = (key: keyof Config): string|undefined=>{
const get = <K extends keyof Config>(key: K): Config[K]=>{
 const config = load();
 return config[key];
};

const set = (key: keyof Config, value: string)=>{
const set = <K extends keyof Config>(key: K, value: Config[K])=>{
 const config = load();
 config[key] = value;
 save(config);
Expand All@@ -50,7 +56,7 @@ const set = (key: keyof Config, value: string)=>{
const resolve = (
 cli_val: string|undefined,
 env_key: string,
 config_key: keyof Config
 config_key: String_config_key
): string|undefined=>{
 if (cli_val)
 return cli_val;
Expand Down

17 changes: 15 additions & 2 deletions
src/utils/output.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,8 @@
import fs from 'fs';
import path from 'path';

import {get as get_config} from './config';

const is_tty = process.stdout.isTTY === true;

const ansi = (code: string, text: string)=>
Expand DownExpand Up@@ -84,10 +86,21 @@ const cell_to_string = (val: unknown): string=>{
 return JSON.stringify(val);
};

const sanitize_csv_cell = (s: string): string=>{
@artemo-brdartemo-brdAug 31, 2026•

edited

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Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Please add a global sanitize_csv configuration option that users can set with:
brightdata config set sanitize_csv false
brightdata config set sanitize_csv true

It should default to true. Since config values currently enter through the CLI as strings, please validate and convert "true"/"false" to actual booleans when setting or reading this option; "false" must not be treated as a truthy string. Other values should be rejected.
We can add per-command overrides later if needed (scrape, search, pipelines, discover, scraper, browser),
 const trimmed = s.trim();
 if (/^[+-]?(?:\d+(?:\.\d+)?|\.\d+)$/.test(trimmed))
 return s;
 if (/^[\s\u00a0]*[=+\-@]/.test(s))
 return "'" + s;
 return s;
};

const csv_escape = (val: unknown): string=>{
 const s = cell_to_string(val);
 let s = cell_to_string(val);
 if (typeof val == 'string' && get_config('sanitize_csv') !== false)
 s = sanitize_csv_cell(s);
 if (/[",\r\n]/.test(s))
 return '"'+s.replace(/"/g, '""')+'"';
 return '"' + s.replace(/"/g, '""') + '"';
 return s;
};

Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
fix(output): prevent CSV formula injection#31

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to your account

 Open

zoya-brd
wants to merge
2
commits into

base:main
Choose a base branch

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fix(output): prevent CSV formula injection
#31
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f89c483

fix(output): prevent CVS formula injection


zoya-brd Aug 31, 2026
cacd7ea

fix(output): improve CVS sanitization config


zoya-brd Sep 1, 2026

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51 changes: 50 additions & 1 deletion
src/__tests__/utils/output.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,9 +2,22 @@ import {describe, it, expect, vi, beforeEach, afterEach} from 'vitest';
import fs from 'fs';
import path from 'path';
import os from 'os';
import {serialize, format_from_ext, print} from '../../utils/output';

const mocks = vi.hoisted(()=>({
 get_config: vi.fn(),
}));
vi.mock('../../utils/config', ()=>({
 get: mocks.get_config,
}));

import {serialize, format_from_ext, print} from '../../utils/output';
describe('utils/output.serialize csv', ()=>{
 beforeEach(()=>{
 mocks.get_config.mockReturnValue(true);
 });
 afterEach(()=>{
 mocks.get_config.mockReset();
 });
 it('serializes array of flat objects as RFC 4180 CSV with header row', ()=>{
 const rows = [
 {url: 'https://a.test/1', title: 'A', price: 1.5},
Expand DownExpand Up@@ -46,6 +59,42 @@ describe('utils/output.serialize csv', ()=>{
 const lines = out.trim().split('\n');
 expect(lines[1]).toBe('1,"{""tag"":""x""}"');
 });
 it('sanitizes spreadsheet formula prefixes in CSV string cells', ()=>{
 const rows = [{
 equals: '=1+1',
 space: ' =1+1',
 multi_space: ' =1+1',
 tab: '\t=1+1',
 nbsp: '\u00a0=1+1',
 plus: '+cmd',
 minus: '-SUM(A1:A2)',
 at: '@SUM(A1:A2)',
 }];
 const out = serialize(rows, 'csv');
 expect(out).toContain("'=1+1");
 expect(out).toContain("' =1+1");
 expect(out).toContain("' =1+1");
 expect(out).toContain("'\t=1+1");
 expect(out).toContain("'\u00a0=1+1");
 expect(out).toContain("'+cmd");
 expect(out).toContain("'-SUM(A1:A2)");
 expect(out).toContain("'@SUM(A1:A2)");
 });
 it('does not sanitize numeric values', ()=>{
 const out = serialize([{value: -100}], 'csv');
 const lines = out.trim().split('\n');
 expect(lines[1]).toBe('-100');
 });
 it('preserves numeric-looking CSV strings', ()=>{
 const out = serialize([{negative: '-100', positive: '+15'}], 'csv');
 expect(out).toContain('-100,+15');
 });
 it('does not sanitize CSV cells when sanitize_csv is false', ()=>{
 mocks.get_config.mockReturnValue(false);
 const out = serialize([{value: '=1+1'}], 'csv');
 expect(out).toContain('=1+1');
 expect(out).not.toContain("'=1+1");
 });
});

describe('utils/output.serialize markdown', ()=>{
Expand Down

15 changes: 13 additions & 2 deletions
src/commands/config.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -14,6 +14,7 @@ const CONFIG_KEYS: Config_key[] = [
 'default_zone_serp',
 'default_format',
 'api_url',
 'sanitize_csv',
];

const format_keys = ()=>CONFIG_KEYS.join(', ');
Expand DownExpand Up@@ -50,12 +51,22 @@ const handle_get_config = (key: string)=>{
 );
 return;
 }
 process.stdout.write(value+'\n');
 process.stdout.write(String(value)+'\n');
};

const handle_set_config = (key: string, value: string)=>{
 const valid_key = ensure_valid_key(key);
 set_config(valid_key, value);
 if (valid_key == 'sanitize_csv')
 {
 if (value != 'true' && value != 'false')
 {
 fail('sanitize_csv must be true or false');
 return;
 }
 set_config(valid_key, value == 'true');
 }
 else
 set_config(valid_key, value);
 success(`Config updated: ${valid_key}=${value}`);
};

Expand Down

12 changes: 9 additions & 3 deletions
src/utils/config.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -9,11 +9,17 @@ type Config = {
 default_zone_serp?: string;
 default_format?: string;
 api_url?: string;
 sanitize_csv?: boolean;
};

type String_config_key = {
 [K in keyof Config]-?: Config[K] extends string|undefined ? K : never
}[keyof Config];

const DEFAULTS: Config = {
 default_format: 'markdown',
 api_url: 'https://api.brightdata.com',
 sanitize_csv: true,
};

const load = (): Config=>{
Expand All@@ -35,12 +41,12 @@ const save = (config: Config)=>{
 fs.writeFileSync(get_config_path(), JSON.stringify(config, null, 4));
};

const get = (key: keyof Config): string|undefined=>{
const get = <K extends keyof Config>(key: K): Config[K]=>{
 const config = load();
 return config[key];
};

const set = (key: keyof Config, value: string)=>{
const set = <K extends keyof Config>(key: K, value: Config[K])=>{
 const config = load();
 config[key] = value;
 save(config);
Expand All@@ -50,7 +56,7 @@ const set = (key: keyof Config, value: string)=>{
const resolve = (
 cli_val: string|undefined,
 env_key: string,
 config_key: keyof Config
 config_key: String_config_key
): string|undefined=>{
 if (cli_val)
 return cli_val;
Expand Down

17 changes: 15 additions & 2 deletions
src/utils/output.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,8 @@
import fs from 'fs';
import path from 'path';

import {get as get_config} from './config';

const is_tty = process.stdout.isTTY === true;

const ansi = (code: string, text: string)=>
Expand DownExpand Up@@ -84,10 +86,21 @@ const cell_to_string = (val: unknown): string=>{
 return JSON.stringify(val);
};

const sanitize_csv_cell = (s: string): string=>{
@artemo-brdartemo-brdAug 31, 2026•

edited

Loading

Copy link


Copy Markdown

Contributor
Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Please add a global sanitize_csv configuration option that users can set with:
brightdata config set sanitize_csv false
brightdata config set sanitize_csv true

It should default to true. Since config values currently enter through the CLI as strings, please validate and convert "true"/"false" to actual booleans when setting or reading this option; "false" must not be treated as a truthy string. Other values should be rejected.
We can add per-command overrides later if needed (scrape, search, pipelines, discover, scraper, browser),
 const trimmed = s.trim();
 if (/^[+-]?(?:\d+(?:\.\d+)?|\.\d+)$/.test(trimmed))
 return s;
 if (/^[\s\u00a0]*[=+\-@]/.test(s))
 return "'" + s;
 return s;
};

const csv_escape = (val: unknown): string=>{
 const s = cell_to_string(val);
 let s = cell_to_string(val);
 if (typeof val == 'string' && get_config('sanitize_csv') !== false)
 s = sanitize_csv_cell(s);
 if (/[",\r\n]/.test(s))
 return '"'+s.replace(/"/g, '""')+'"';
 return '"' + s.replace(/"/g, '""') + '"';
 return s;
};

Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
fix(output): prevent CSV formula injection#31

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privacy statement. We’ll occasionally send you account related emails.

Already on GitHub?
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to your account

 Open

zoya-brd
wants to merge
2
commits into

base:main
Choose a base branch

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+87

−8

 Open


fix(output): prevent CSV formula injection
#31
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f89c483

fix(output): prevent CVS formula injection


zoya-brd Aug 31, 2026
cacd7ea

fix(output): improve CVS sanitization config


zoya-brd Sep 1, 2026

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51 changes: 50 additions & 1 deletion
src/__tests__/utils/output.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,9 +2,22 @@ import {describe, it, expect, vi, beforeEach, afterEach} from 'vitest';
import fs from 'fs';
import path from 'path';
import os from 'os';
import {serialize, format_from_ext, print} from '../../utils/output';

const mocks = vi.hoisted(()=>({
 get_config: vi.fn(),
}));
vi.mock('../../utils/config', ()=>({
 get: mocks.get_config,
}));

import {serialize, format_from_ext, print} from '../../utils/output';
describe('utils/output.serialize csv', ()=>{
 beforeEach(()=>{
 mocks.get_config.mockReturnValue(true);
 });
 afterEach(()=>{
 mocks.get_config.mockReset();
 });
 it('serializes array of flat objects as RFC 4180 CSV with header row', ()=>{
 const rows = [
 {url: 'https://a.test/1', title: 'A', price: 1.5},
Expand DownExpand Up@@ -46,6 +59,42 @@ describe('utils/output.serialize csv', ()=>{
 const lines = out.trim().split('\n');
 expect(lines[1]).toBe('1,"{""tag"":""x""}"');
 });
 it('sanitizes spreadsheet formula prefixes in CSV string cells', ()=>{
 const rows = [{
 equals: '=1+1',
 space: ' =1+1',
 multi_space: ' =1+1',
 tab: '\t=1+1',
 nbsp: '\u00a0=1+1',
 plus: '+cmd',
 minus: '-SUM(A1:A2)',
 at: '@SUM(A1:A2)',
 }];
 const out = serialize(rows, 'csv');
 expect(out).toContain("'=1+1");
 expect(out).toContain("' =1+1");
 expect(out).toContain("' =1+1");
 expect(out).toContain("'\t=1+1");
 expect(out).toContain("'\u00a0=1+1");
 expect(out).toContain("'+cmd");
 expect(out).toContain("'-SUM(A1:A2)");
 expect(out).toContain("'@SUM(A1:A2)");
 });
 it('does not sanitize numeric values', ()=>{
 const out = serialize([{value: -100}], 'csv');
 const lines = out.trim().split('\n');
 expect(lines[1]).toBe('-100');
 });
 it('preserves numeric-looking CSV strings', ()=>{
 const out = serialize([{negative: '-100', positive: '+15'}], 'csv');
 expect(out).toContain('-100,+15');
 });
 it('does not sanitize CSV cells when sanitize_csv is false', ()=>{
 mocks.get_config.mockReturnValue(false);
 const out = serialize([{value: '=1+1'}], 'csv');
 expect(out).toContain('=1+1');
 expect(out).not.toContain("'=1+1");
 });
});

describe('utils/output.serialize markdown', ()=>{
Expand Down

15 changes: 13 additions & 2 deletions
src/commands/config.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -14,6 +14,7 @@ const CONFIG_KEYS: Config_key[] = [
 'default_zone_serp',
 'default_format',
 'api_url',
 'sanitize_csv',
];

const format_keys = ()=>CONFIG_KEYS.join(', ');
Expand DownExpand Up@@ -50,12 +51,22 @@ const handle_get_config = (key: string)=>{
 );
 return;
 }
 process.stdout.write(value+'\n');
 process.stdout.write(String(value)+'\n');
};

const handle_set_config = (key: string, value: string)=>{
 const valid_key = ensure_valid_key(key);
 set_config(valid_key, value);
 if (valid_key == 'sanitize_csv')
 {
 if (value != 'true' && value != 'false')
 {
 fail('sanitize_csv must be true or false');
 return;
 }
 set_config(valid_key, value == 'true');
 }
 else
 set_config(valid_key, value);
 success(`Config updated: ${valid_key}=${value}`);
};

Expand Down

12 changes: 9 additions & 3 deletions
src/utils/config.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -9,11 +9,17 @@ type Config = {
 default_zone_serp?: string;
 default_format?: string;
 api_url?: string;
 sanitize_csv?: boolean;
};

type String_config_key = {
 [K in keyof Config]-?: Config[K] extends string|undefined ? K : never
}[keyof Config];

const DEFAULTS: Config = {
 default_format: 'markdown',
 api_url: 'https://api.brightdata.com',
 sanitize_csv: true,
};

const load = (): Config=>{
Expand All@@ -35,12 +41,12 @@ const save = (config: Config)=>{
 fs.writeFileSync(get_config_path(), JSON.stringify(config, null, 4));
};

const get = (key: keyof Config): string|undefined=>{
const get = <K extends keyof Config>(key: K): Config[K]=>{
 const config = load();
 return config[key];
};

const set = (key: keyof Config, value: string)=>{
const set = <K extends keyof Config>(key: K, value: Config[K])=>{
 const config = load();
 config[key] = value;
 save(config);
Expand All@@ -50,7 +56,7 @@ const set = (key: keyof Config, value: string)=>{
const resolve = (
 cli_val: string|undefined,
 env_key: string,
 config_key: keyof Config
 config_key: String_config_key
): string|undefined=>{
 if (cli_val)
 return cli_val;
Expand Down

17 changes: 15 additions & 2 deletions
src/utils/output.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,8 @@
import fs from 'fs';
import path from 'path';

import {get as get_config} from './config';

const is_tty = process.stdout.isTTY === true;

const ansi = (code: string, text: string)=>
Expand DownExpand Up@@ -84,10 +86,21 @@ const cell_to_string = (val: unknown): string=>{
 return JSON.stringify(val);
};

const sanitize_csv_cell = (s: string): string=>{
@artemo-brdartemo-brdAug 31, 2026•

edited

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Please add a global sanitize_csv configuration option that users can set with:
brightdata config set sanitize_csv false
brightdata config set sanitize_csv true

It should default to true. Since config values currently enter through the CLI as strings, please validate and convert "true"/"false" to actual booleans when setting or reading this option; "false" must not be treated as a truthy string. Other values should be rejected.
We can add per-command overrides later if needed (scrape, search, pipelines, discover, scraper, browser),
 const trimmed = s.trim();
 if (/^[+-]?(?:\d+(?:\.\d+)?|\.\d+)$/.test(trimmed))
 return s;
 if (/^[\s\u00a0]*[=+\-@]/.test(s))
 return "'" + s;
 return s;
};

const csv_escape = (val: unknown): string=>{
 const s = cell_to_string(val);
 let s = cell_to_string(val);
 if (typeof val == 'string' && get_config('sanitize_csv') !== false)
 s = sanitize_csv_cell(s);
 if (/[",\r\n]/.test(s))
 return '"'+s.replace(/"/g, '""')+'"';
 return '"' + s.replace(/"/g, '""') + '"';
 return s;
};

Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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fix(output): prevent CSV formula injection#31

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fix(output): prevent CSV formula injection
#31
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f89c483

fix(output): prevent CVS formula injection


zoya-brd Aug 31, 2026
cacd7ea

fix(output): improve CVS sanitization config


zoya-brd Sep 1, 2026

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51 changes: 50 additions & 1 deletion
src/__tests__/utils/output.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,9 +2,22 @@ import {describe, it, expect, vi, beforeEach, afterEach} from 'vitest';
import fs from 'fs';
import path from 'path';
import os from 'os';
import {serialize, format_from_ext, print} from '../../utils/output';

const mocks = vi.hoisted(()=>({
 get_config: vi.fn(),
}));
vi.mock('../../utils/config', ()=>({
 get: mocks.get_config,
}));

import {serialize, format_from_ext, print} from '../../utils/output';
describe('utils/output.serialize csv', ()=>{
 beforeEach(()=>{
 mocks.get_config.mockReturnValue(true);
 });
 afterEach(()=>{
 mocks.get_config.mockReset();
 });
 it('serializes array of flat objects as RFC 4180 CSV with header row', ()=>{
 const rows = [
 {url: 'https://a.test/1', title: 'A', price: 1.5},
Expand DownExpand Up@@ -46,6 +59,42 @@ describe('utils/output.serialize csv', ()=>{
 const lines = out.trim().split('\n');
 expect(lines[1]).toBe('1,"{""tag"":""x""}"');
 });
 it('sanitizes spreadsheet formula prefixes in CSV string cells', ()=>{
 const rows = [{
 equals: '=1+1',
 space: ' =1+1',
 multi_space: ' =1+1',
 tab: '\t=1+1',
 nbsp: '\u00a0=1+1',
 plus: '+cmd',
 minus: '-SUM(A1:A2)',
 at: '@SUM(A1:A2)',
 }];
 const out = serialize(rows, 'csv');
 expect(out).toContain("'=1+1");
 expect(out).toContain("' =1+1");
 expect(out).toContain("' =1+1");
 expect(out).toContain("'\t=1+1");
 expect(out).toContain("'\u00a0=1+1");
 expect(out).toContain("'+cmd");
 expect(out).toContain("'-SUM(A1:A2)");
 expect(out).toContain("'@SUM(A1:A2)");
 });
 it('does not sanitize numeric values', ()=>{
 const out = serialize([{value: -100}], 'csv');
 const lines = out.trim().split('\n');
 expect(lines[1]).toBe('-100');
 });
 it('preserves numeric-looking CSV strings', ()=>{
 const out = serialize([{negative: '-100', positive: '+15'}], 'csv');
 expect(out).toContain('-100,+15');
 });
 it('does not sanitize CSV cells when sanitize_csv is false', ()=>{
 mocks.get_config.mockReturnValue(false);
 const out = serialize([{value: '=1+1'}], 'csv');
 expect(out).toContain('=1+1');
 expect(out).not.toContain("'=1+1");
 });
});

describe('utils/output.serialize markdown', ()=>{
Expand Down

15 changes: 13 additions & 2 deletions
src/commands/config.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -14,6 +14,7 @@ const CONFIG_KEYS: Config_key[] = [
 'default_zone_serp',
 'default_format',
 'api_url',
 'sanitize_csv',
];

const format_keys = ()=>CONFIG_KEYS.join(', ');
Expand DownExpand Up@@ -50,12 +51,22 @@ const handle_get_config = (key: string)=>{
 );
 return;
 }
 process.stdout.write(value+'\n');
 process.stdout.write(String(value)+'\n');
};

const handle_set_config = (key: string, value: string)=>{
 const valid_key = ensure_valid_key(key);
 set_config(valid_key, value);
 if (valid_key == 'sanitize_csv')
 {
 if (value != 'true' && value != 'false')
 {
 fail('sanitize_csv must be true or false');
 return;
 }
 set_config(valid_key, value == 'true');
 }
 else
 set_config(valid_key, value);
 success(`Config updated: ${valid_key}=${value}`);
};

Expand Down

12 changes: 9 additions & 3 deletions
src/utils/config.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -9,11 +9,17 @@ type Config = {
 default_zone_serp?: string;
 default_format?: string;
 api_url?: string;
 sanitize_csv?: boolean;
};

type String_config_key = {
 [K in keyof Config]-?: Config[K] extends string|undefined ? K : never
}[keyof Config];

const DEFAULTS: Config = {
 default_format: 'markdown',
 api_url: 'https://api.brightdata.com',
 sanitize_csv: true,
};

const load = (): Config=>{
Expand All@@ -35,12 +41,12 @@ const save = (config: Config)=>{
 fs.writeFileSync(get_config_path(), JSON.stringify(config, null, 4));
};

const get = (key: keyof Config): string|undefined=>{
const get = <K extends keyof Config>(key: K): Config[K]=>{
 const config = load();
 return config[key];
};

const set = (key: keyof Config, value: string)=>{
const set = <K extends keyof Config>(key: K, value: Config[K])=>{
 const config = load();
 config[key] = value;
 save(config);
Expand All@@ -50,7 +56,7 @@ const set = (key: keyof Config, value: string)=>{
const resolve = (
 cli_val: string|undefined,
 env_key: string,
 config_key: keyof Config
 config_key: String_config_key
): string|undefined=>{
 if (cli_val)
 return cli_val;
Expand Down

17 changes: 15 additions & 2 deletions
src/utils/output.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,8 @@
import fs from 'fs';
import path from 'path';

import {get as get_config} from './config';

const is_tty = process.stdout.isTTY === true;

const ansi = (code: string, text: string)=>
Expand DownExpand Up@@ -84,10 +86,21 @@ const cell_to_string = (val: unknown): string=>{
 return JSON.stringify(val);
};

const sanitize_csv_cell = (s: string): string=>{
@artemo-brdartemo-brdAug 31, 2026•

edited

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Copy Markdown

Contributor
Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Please add a global sanitize_csv configuration option that users can set with:
brightdata config set sanitize_csv false
brightdata config set sanitize_csv true

It should default to true. Since config values currently enter through the CLI as strings, please validate and convert "true"/"false" to actual booleans when setting or reading this option; "false" must not be treated as a truthy string. Other values should be rejected.
We can add per-command overrides later if needed (scrape, search, pipelines, discover, scraper, browser),
 const trimmed = s.trim();
 if (/^[+-]?(?:\d+(?:\.\d+)?|\.\d+)$/.test(trimmed))
 return s;
 if (/^[\s\u00a0]*[=+\-@]/.test(s))
 return "'" + s;
 return s;
};

const csv_escape = (val: unknown): string=>{
 const s = cell_to_string(val);
 let s = cell_to_string(val);
 if (typeof val == 'string' && get_config('sanitize_csv') !== false)
 s = sanitize_csv_cell(s);
 if (/[",\r\n]/.test(s))
 return '"'+s.replace(/"/g, '""')+'"';
 return '"' + s.replace(/"/g, '""') + '"';
 return s;
};

Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
fix(output): prevent CSV formula injection#31

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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privacy statement. We’ll occasionally send you account related emails.

Already on GitHub?
Sign in
to your account

 Open

zoya-brd
wants to merge
2
commits into

base:main
Choose a base branch

from


+87

−8

 Open


fix(output): prevent CSV formula injection
#31
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f89c483

fix(output): prevent CVS formula injection


zoya-brd Aug 31, 2026
cacd7ea

fix(output): improve CVS sanitization config


zoya-brd Sep 1, 2026

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51 changes: 50 additions & 1 deletion
src/__tests__/utils/output.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -2,9 +2,22 @@ import {describe, it, expect, vi, beforeEach, afterEach} from 'vitest';
import fs from 'fs';
import path from 'path';
import os from 'os';
import {serialize, format_from_ext, print} from '../../utils/output';

const mocks = vi.hoisted(()=>({
 get_config: vi.fn(),
}));
vi.mock('../../utils/config', ()=>({
 get: mocks.get_config,
}));

import {serialize, format_from_ext, print} from '../../utils/output';
describe('utils/output.serialize csv', ()=>{
 beforeEach(()=>{
 mocks.get_config.mockReturnValue(true);
 });
 afterEach(()=>{
 mocks.get_config.mockReset();
 });
 it('serializes array of flat objects as RFC 4180 CSV with header row', ()=>{
 const rows = [
 {url: 'https://a.test/1', title: 'A', price: 1.5},
Expand DownExpand Up@@ -46,6 +59,42 @@ describe('utils/output.serialize csv', ()=>{
 const lines = out.trim().split('\n');
 expect(lines[1]).toBe('1,"{""tag"":""x""}"');
 });
 it('sanitizes spreadsheet formula prefixes in CSV string cells', ()=>{
 const rows = [{
 equals: '=1+1',
 space: ' =1+1',
 multi_space: ' =1+1',
 tab: '\t=1+1',
 nbsp: '\u00a0=1+1',
 plus: '+cmd',
 minus: '-SUM(A1:A2)',
 at: '@SUM(A1:A2)',
 }];
 const out = serialize(rows, 'csv');
 expect(out).toContain("'=1+1");
 expect(out).toContain("' =1+1");
 expect(out).toContain("' =1+1");
 expect(out).toContain("'\t=1+1");
 expect(out).toContain("'\u00a0=1+1");
 expect(out).toContain("'+cmd");
 expect(out).toContain("'-SUM(A1:A2)");
 expect(out).toContain("'@SUM(A1:A2)");
 });
 it('does not sanitize numeric values', ()=>{
 const out = serialize([{value: -100}], 'csv');
 const lines = out.trim().split('\n');
 expect(lines[1]).toBe('-100');
 });
 it('preserves numeric-looking CSV strings', ()=>{
 const out = serialize([{negative: '-100', positive: '+15'}], 'csv');
 expect(out).toContain('-100,+15');
 });
 it('does not sanitize CSV cells when sanitize_csv is false', ()=>{
 mocks.get_config.mockReturnValue(false);
 const out = serialize([{value: '=1+1'}], 'csv');
 expect(out).toContain('=1+1');
 expect(out).not.toContain("'=1+1");
 });
});

describe('utils/output.serialize markdown', ()=>{
Expand Down

15 changes: 13 additions & 2 deletions
src/commands/config.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -14,6 +14,7 @@ const CONFIG_KEYS: Config_key[] = [
 'default_zone_serp',
 'default_format',
 'api_url',
 'sanitize_csv',
];

const format_keys = ()=>CONFIG_KEYS.join(', ');
Expand DownExpand Up@@ -50,12 +51,22 @@ const handle_get_config = (key: string)=>{
 );
 return;
 }
 process.stdout.write(value+'\n');
 process.stdout.write(String(value)+'\n');
};

const handle_set_config = (key: string, value: string)=>{
 const valid_key = ensure_valid_key(key);
 set_config(valid_key, value);
 if (valid_key == 'sanitize_csv')
 {
 if (value != 'true' && value != 'false')
 {
 fail('sanitize_csv must be true or false');
 return;
 }
 set_config(valid_key, value == 'true');
 }
 else
 set_config(valid_key, value);
 success(`Config updated: ${valid_key}=${value}`);
};

Expand Down

12 changes: 9 additions & 3 deletions
src/utils/config.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -9,11 +9,17 @@ type Config = {
 default_zone_serp?: string;
 default_format?: string;
 api_url?: string;
 sanitize_csv?: boolean;
};

type String_config_key = {
 [K in keyof Config]-?: Config[K] extends string|undefined ? K : never
}[keyof Config];

const DEFAULTS: Config = {
 default_format: 'markdown',
 api_url: 'https://api.brightdata.com',
 sanitize_csv: true,
};

const load = (): Config=>{
Expand All@@ -35,12 +41,12 @@ const save = (config: Config)=>{
 fs.writeFileSync(get_config_path(), JSON.stringify(config, null, 4));
};

const get = (key: keyof Config): string|undefined=>{
const get = <K extends keyof Config>(key: K): Config[K]=>{
 const config = load();
 return config[key];
};

const set = (key: keyof Config, value: string)=>{
const set = <K extends keyof Config>(key: K, value: Config[K])=>{
 const config = load();
 config[key] = value;
 save(config);
Expand All@@ -50,7 +56,7 @@ const set = (key: keyof Config, value: string)=>{
const resolve = (
 cli_val: string|undefined,
 env_key: string,
 config_key: keyof Config
 config_key: String_config_key
): string|undefined=>{
 if (cli_val)
 return cli_val;
Expand Down

17 changes: 15 additions & 2 deletions
src/utils/output.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -1,6 +1,8 @@
import fs from 'fs';
import path from 'path';

import {get as get_config} from './config';

const is_tty = process.stdout.isTTY === true;

const ansi = (code: string, text: string)=>
Expand DownExpand Up@@ -84,10 +86,21 @@ const cell_to_string = (val: unknown): string=>{
 return JSON.stringify(val);
};

const sanitize_csv_cell = (s: string): string=>{
@artemo-brdartemo-brdAug 31, 2026•

edited

Loading

Copy link


Copy Markdown

Contributor
Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Please add a global sanitize_csv configuration option that users can set with:
brightdata config set sanitize_csv false
brightdata config set sanitize_csv true

It should default to true. Since config values currently enter through the CLI as strings, please validate and convert "true"/"false" to actual booleans when setting or reading this option; "false" must not be treated as a truthy string. Other values should be rejected.
We can add per-command overrides later if needed (scrape, search, pipelines, discover, scraper, browser),
 const trimmed = s.trim();
 if (/^[+-]?(?:\d+(?:\.\d+)?|\.\d+)$/.test(trimmed))
 return s;
 if (/^[\s\u00a0]*[=+\-@]/.test(s))
 return "'" + s;
 return s;
};

const csv_escape = (val: unknown): string=>{
 const s = cell_to_string(val);
 let s = cell_to_string(val);
 if (typeof val == 'string' && get_config('sanitize_csv') !== false)
 s = sanitize_csv_cell(s);
 if (/[",\r\n]/.test(s))
 return '"'+s.replace(/"/g, '""')+'"';
 return '"' + s.replace(/"/g, '""') + '"';
 return s;
};

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