fix(nextjs): Use constant-time comparison in assertTokenSignature - #8411

Merged
jacekradko merged 3 commits into
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jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac
Apr 28, 2026
Merged

fix(nextjs): Use constant-time comparison in assertTokenSignature#8411
jacekradko merged 3 commits into
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jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac

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Summary

  • Switches assertTokenSignature in @clerk/nextjs to a constant-time string comparison for the HMAC-SHA1 integrity signature on the middleware-to-origin auth header handoff.
  • The new constantTimeEqual helper is pure JS, synchronous, and runtime-agnostic so it works the same way in Node and in Edge Runtime (where node:crypto.timingSafeEqual isn't reliably available). The signature is a fixed-length 40-character hex digest, so the early length check leaks nothing secret.
  • Resolves AISEC-8.

Test plan

  • pnpm turbo build --filter=@clerk/nextjs succeeds
  • pnpm --filter=@clerk/nextjs test — all 36 test files / 195 tests pass, including a new src/server/__tests__/utils.test.ts covering match, missing, last-character mismatch, and length mismatch
  • pnpm --filter=@clerk/nextjs lint — no new warnings on touched files

The middleware-to-origin auth header integrity check now uses a
constant-time string compare. The helper is synchronous and
runtime-agnostic so it works in both Node and Edge Runtime.
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🦋 Changeset detected

Latest commit: ea23f69

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package
NameType
@clerk/nextjsPatch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
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Review profile: CHILL

Plan: Pro

Run ID: f8bdb8fd-26e0-4408-a15a-613c67181fd6

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📒 Files selected for processing (1)
  • packages/nextjs/src/server/utils.ts

📝 Walkthrough

Walkthrough

A changeset is added for @clerk/nextjs (patch release). assertTokenSignature in packages/nextjs/src/server/utils.ts was changed to use a new constantTimeEqual helper for signature comparison (replacing a direct !== check) and still throws authSignatureInvalid on mismatch. A new test file packages/nextjs/src/server/__tests__/utils.test.ts exercises matching, missing (undefined/null/empty), tampered, truncated, and extended signatures.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check nameStatusExplanation
Title check✅ PassedThe title accurately describes the main change: replacing non-constant-time string comparison with constant-time comparison in assertTokenSignature.
Description check✅ PassedThe description provides clear context about the security fix, implementation details, and references the specific issue (AISEC-8) being resolved.
Docstring Coverage✅ PassedDocstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check✅ PassedCheck skipped because no linked issues were found for this pull request.
Out of Scope Changes check✅ PassedCheck skipped because no linked issues were found for this pull request.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.


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commit: ea23f69

@jacekradko
jacekradko merged commit 115cf98 into mainApr 28, 2026
68 of 72 checks passed
@jacekradko
jacekradko deleted the jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac branch April 28, 2026 03:17
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, '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" + '
Skip to content

fix(nextjs): Use constant-time comparison in assertTokenSignature - #8411

Merged
jacekradko merged 3 commits into
mainfrom
jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac
Apr 28, 2026
Merged

fix(nextjs): Use constant-time comparison in assertTokenSignature#8411
jacekradko merged 3 commits into
mainfrom
jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac

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@jacekradko

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Summary

  • Switches assertTokenSignature in @clerk/nextjs to a constant-time string comparison for the HMAC-SHA1 integrity signature on the middleware-to-origin auth header handoff.
  • The new constantTimeEqual helper is pure JS, synchronous, and runtime-agnostic so it works the same way in Node and in Edge Runtime (where node:crypto.timingSafeEqual isn't reliably available). The signature is a fixed-length 40-character hex digest, so the early length check leaks nothing secret.
  • Resolves AISEC-8.

Test plan

  • pnpm turbo build --filter=@clerk/nextjs succeeds
  • pnpm --filter=@clerk/nextjs test — all 36 test files / 195 tests pass, including a new src/server/__tests__/utils.test.ts covering match, missing, last-character mismatch, and length mismatch
  • pnpm --filter=@clerk/nextjs lint — no new warnings on touched files

The middleware-to-origin auth header integrity check now uses a
constant-time string compare. The helper is synchronous and
runtime-agnostic so it works in both Node and Edge Runtime.
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🦋 Changeset detected

Latest commit: ea23f69

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package
NameType
@clerk/nextjsPatch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro

Run ID: f8bdb8fd-26e0-4408-a15a-613c67181fd6

📥 Commits

Reviewing files that changed from the base of the PR and between 8e75773 and ea23f69.

📒 Files selected for processing (1)
  • packages/nextjs/src/server/utils.ts

📝 Walkthrough

Walkthrough

A changeset is added for @clerk/nextjs (patch release). assertTokenSignature in packages/nextjs/src/server/utils.ts was changed to use a new constantTimeEqual helper for signature comparison (replacing a direct !== check) and still throws authSignatureInvalid on mismatch. A new test file packages/nextjs/src/server/__tests__/utils.test.ts exercises matching, missing (undefined/null/empty), tampered, truncated, and extended signatures.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check nameStatusExplanation
Title check✅ PassedThe title accurately describes the main change: replacing non-constant-time string comparison with constant-time comparison in assertTokenSignature.
Description check✅ PassedThe description provides clear context about the security fix, implementation details, and references the specific issue (AISEC-8) being resolved.
Docstring Coverage✅ PassedDocstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check✅ PassedCheck skipped because no linked issues were found for this pull request.
Out of Scope Changes check✅ PassedCheck skipped because no linked issues were found for this pull request.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.


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@clerk/react

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@clerk/shared

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@clerk/vue

npm i https://pkg.pr.new/@clerk/vue@8411

commit: ea23f69

@jacekradko
jacekradko merged commit 115cf98 into mainApr 28, 2026
68 of 72 checks passed
@jacekradko
jacekradko deleted the jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac branch April 28, 2026 03:17
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, '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(nextjs): Use constant-time comparison in assertTokenSignature - #8411

Merged
jacekradko merged 3 commits into
mainfrom
jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac
Apr 28, 2026
Merged

fix(nextjs): Use constant-time comparison in assertTokenSignature#8411
jacekradko merged 3 commits into
mainfrom
jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac

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Summary

  • Switches assertTokenSignature in @clerk/nextjs to a constant-time string comparison for the HMAC-SHA1 integrity signature on the middleware-to-origin auth header handoff.
  • The new constantTimeEqual helper is pure JS, synchronous, and runtime-agnostic so it works the same way in Node and in Edge Runtime (where node:crypto.timingSafeEqual isn't reliably available). The signature is a fixed-length 40-character hex digest, so the early length check leaks nothing secret.
  • Resolves AISEC-8.

Test plan

  • pnpm turbo build --filter=@clerk/nextjs succeeds
  • pnpm --filter=@clerk/nextjs test — all 36 test files / 195 tests pass, including a new src/server/__tests__/utils.test.ts covering match, missing, last-character mismatch, and length mismatch
  • pnpm --filter=@clerk/nextjs lint — no new warnings on touched files

The middleware-to-origin auth header integrity check now uses a
constant-time string compare. The helper is synchronous and
runtime-agnostic so it works in both Node and Edge Runtime.
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🦋 Changeset detected

Latest commit: ea23f69

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package
NameType
@clerk/nextjsPatch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro

Run ID: f8bdb8fd-26e0-4408-a15a-613c67181fd6

📥 Commits

Reviewing files that changed from the base of the PR and between 8e75773 and ea23f69.

📒 Files selected for processing (1)
  • packages/nextjs/src/server/utils.ts

📝 Walkthrough

Walkthrough

A changeset is added for @clerk/nextjs (patch release). assertTokenSignature in packages/nextjs/src/server/utils.ts was changed to use a new constantTimeEqual helper for signature comparison (replacing a direct !== check) and still throws authSignatureInvalid on mismatch. A new test file packages/nextjs/src/server/__tests__/utils.test.ts exercises matching, missing (undefined/null/empty), tampered, truncated, and extended signatures.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check nameStatusExplanation
Title check✅ PassedThe title accurately describes the main change: replacing non-constant-time string comparison with constant-time comparison in assertTokenSignature.
Description check✅ PassedThe description provides clear context about the security fix, implementation details, and references the specific issue (AISEC-8) being resolved.
Docstring Coverage✅ PassedDocstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check✅ PassedCheck skipped because no linked issues were found for this pull request.
Out of Scope Changes check✅ PassedCheck skipped because no linked issues were found for this pull request.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.


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@clerk/nextjs

npm i https://pkg.pr.new/@clerk/nextjs@8411

@clerk/nuxt

npm i https://pkg.pr.new/@clerk/nuxt@8411

@clerk/react

npm i https://pkg.pr.new/@clerk/react@8411

@clerk/react-router

npm i https://pkg.pr.new/@clerk/react-router@8411

@clerk/shared

npm i https://pkg.pr.new/@clerk/shared@8411

@clerk/tanstack-react-start

npm i https://pkg.pr.new/@clerk/tanstack-react-start@8411

@clerk/testing

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commit: ea23f69

@jacekradko
jacekradko merged commit 115cf98 into mainApr 28, 2026
68 of 72 checks passed
@jacekradko
jacekradko deleted the jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac branch April 28, 2026 03:17
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, '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('^' + ".*" + '
Skip to content

fix(nextjs): Use constant-time comparison in assertTokenSignature - #8411

Merged
jacekradko merged 3 commits into
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jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac
Apr 28, 2026
Merged

fix(nextjs): Use constant-time comparison in assertTokenSignature#8411
jacekradko merged 3 commits into
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jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac

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Summary

  • Switches assertTokenSignature in @clerk/nextjs to a constant-time string comparison for the HMAC-SHA1 integrity signature on the middleware-to-origin auth header handoff.
  • The new constantTimeEqual helper is pure JS, synchronous, and runtime-agnostic so it works the same way in Node and in Edge Runtime (where node:crypto.timingSafeEqual isn't reliably available). The signature is a fixed-length 40-character hex digest, so the early length check leaks nothing secret.
  • Resolves AISEC-8.

Test plan

  • pnpm turbo build --filter=@clerk/nextjs succeeds
  • pnpm --filter=@clerk/nextjs test — all 36 test files / 195 tests pass, including a new src/server/__tests__/utils.test.ts covering match, missing, last-character mismatch, and length mismatch
  • pnpm --filter=@clerk/nextjs lint — no new warnings on touched files

The middleware-to-origin auth header integrity check now uses a
constant-time string compare. The helper is synchronous and
runtime-agnostic so it works in both Node and Edge Runtime.
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🦋 Changeset detected

Latest commit: ea23f69

The changes in this PR will be included in the next version bump.

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  • packages/nextjs/src/server/utils.ts

📝 Walkthrough

Walkthrough

A changeset is added for @clerk/nextjs (patch release). assertTokenSignature in packages/nextjs/src/server/utils.ts was changed to use a new constantTimeEqual helper for signature comparison (replacing a direct !== check) and still throws authSignatureInvalid on mismatch. A new test file packages/nextjs/src/server/__tests__/utils.test.ts exercises matching, missing (undefined/null/empty), tampered, truncated, and extended signatures.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check nameStatusExplanation
Title check✅ PassedThe title accurately describes the main change: replacing non-constant-time string comparison with constant-time comparison in assertTokenSignature.
Description check✅ PassedThe description provides clear context about the security fix, implementation details, and references the specific issue (AISEC-8) being resolved.
Docstring Coverage✅ PassedDocstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check✅ PassedCheck skipped because no linked issues were found for this pull request.
Out of Scope Changes check✅ PassedCheck skipped because no linked issues were found for this pull request.

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commit: ea23f69

@jacekradko
jacekradko merged commit 115cf98 into mainApr 28, 2026
68 of 72 checks passed
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jacekradko deleted the jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac branch April 28, 2026 03:17
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, '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(nextjs): Use constant-time comparison in assertTokenSignature - #8411

Merged
jacekradko merged 3 commits into
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jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac
Apr 28, 2026
Merged

fix(nextjs): Use constant-time comparison in assertTokenSignature#8411
jacekradko merged 3 commits into
mainfrom
jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac

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Summary

  • Switches assertTokenSignature in @clerk/nextjs to a constant-time string comparison for the HMAC-SHA1 integrity signature on the middleware-to-origin auth header handoff.
  • The new constantTimeEqual helper is pure JS, synchronous, and runtime-agnostic so it works the same way in Node and in Edge Runtime (where node:crypto.timingSafeEqual isn't reliably available). The signature is a fixed-length 40-character hex digest, so the early length check leaks nothing secret.
  • Resolves AISEC-8.

Test plan

  • pnpm turbo build --filter=@clerk/nextjs succeeds
  • pnpm --filter=@clerk/nextjs test — all 36 test files / 195 tests pass, including a new src/server/__tests__/utils.test.ts covering match, missing, last-character mismatch, and length mismatch
  • pnpm --filter=@clerk/nextjs lint — no new warnings on touched files

The middleware-to-origin auth header integrity check now uses a
constant-time string compare. The helper is synchronous and
runtime-agnostic so it works in both Node and Edge Runtime.
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🦋 Changeset detected

Latest commit: ea23f69

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package
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Run ID: f8bdb8fd-26e0-4408-a15a-613c67181fd6

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📒 Files selected for processing (1)
  • packages/nextjs/src/server/utils.ts

📝 Walkthrough

Walkthrough

A changeset is added for @clerk/nextjs (patch release). assertTokenSignature in packages/nextjs/src/server/utils.ts was changed to use a new constantTimeEqual helper for signature comparison (replacing a direct !== check) and still throws authSignatureInvalid on mismatch. A new test file packages/nextjs/src/server/__tests__/utils.test.ts exercises matching, missing (undefined/null/empty), tampered, truncated, and extended signatures.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check nameStatusExplanation
Title check✅ PassedThe title accurately describes the main change: replacing non-constant-time string comparison with constant-time comparison in assertTokenSignature.
Description check✅ PassedThe description provides clear context about the security fix, implementation details, and references the specific issue (AISEC-8) being resolved.
Docstring Coverage✅ PassedDocstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check✅ PassedCheck skipped because no linked issues were found for this pull request.
Out of Scope Changes check✅ PassedCheck skipped because no linked issues were found for this pull request.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.


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@clerk/react

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@clerk/react-router

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commit: ea23f69

@jacekradko
jacekradko merged commit 115cf98 into mainApr 28, 2026
68 of 72 checks passed
@jacekradko
jacekradko deleted the jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac branch April 28, 2026 03:17
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@jacekradko@Ephem
, '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(nextjs): Use constant-time comparison in assertTokenSignature - #8411

Merged
jacekradko merged 3 commits into
mainfrom
jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac
Apr 28, 2026
Merged

fix(nextjs): Use constant-time comparison in assertTokenSignature#8411
jacekradko merged 3 commits into
mainfrom
jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac

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@jacekradko

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Summary

  • Switches assertTokenSignature in @clerk/nextjs to a constant-time string comparison for the HMAC-SHA1 integrity signature on the middleware-to-origin auth header handoff.
  • The new constantTimeEqual helper is pure JS, synchronous, and runtime-agnostic so it works the same way in Node and in Edge Runtime (where node:crypto.timingSafeEqual isn't reliably available). The signature is a fixed-length 40-character hex digest, so the early length check leaks nothing secret.
  • Resolves AISEC-8.

Test plan

  • pnpm turbo build --filter=@clerk/nextjs succeeds
  • pnpm --filter=@clerk/nextjs test — all 36 test files / 195 tests pass, including a new src/server/__tests__/utils.test.ts covering match, missing, last-character mismatch, and length mismatch
  • pnpm --filter=@clerk/nextjs lint — no new warnings on touched files

The middleware-to-origin auth header integrity check now uses a
constant-time string compare. The helper is synchronous and
runtime-agnostic so it works in both Node and Edge Runtime.
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🦋 Changeset detected

Latest commit: ea23f69

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package
NameType
@clerk/nextjsPatch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro

Run ID: f8bdb8fd-26e0-4408-a15a-613c67181fd6

📥 Commits

Reviewing files that changed from the base of the PR and between 8e75773 and ea23f69.

📒 Files selected for processing (1)
  • packages/nextjs/src/server/utils.ts

📝 Walkthrough

Walkthrough

A changeset is added for @clerk/nextjs (patch release). assertTokenSignature in packages/nextjs/src/server/utils.ts was changed to use a new constantTimeEqual helper for signature comparison (replacing a direct !== check) and still throws authSignatureInvalid on mismatch. A new test file packages/nextjs/src/server/__tests__/utils.test.ts exercises matching, missing (undefined/null/empty), tampered, truncated, and extended signatures.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check nameStatusExplanation
Title check✅ PassedThe title accurately describes the main change: replacing non-constant-time string comparison with constant-time comparison in assertTokenSignature.
Description check✅ PassedThe description provides clear context about the security fix, implementation details, and references the specific issue (AISEC-8) being resolved.
Docstring Coverage✅ PassedDocstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check✅ PassedCheck skipped because no linked issues were found for this pull request.
Out of Scope Changes check✅ PassedCheck skipped because no linked issues were found for this pull request.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.


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@clerk/nextjs

npm i https://pkg.pr.new/@clerk/nextjs@8411

@clerk/nuxt

npm i https://pkg.pr.new/@clerk/nuxt@8411

@clerk/react

npm i https://pkg.pr.new/@clerk/react@8411

@clerk/react-router

npm i https://pkg.pr.new/@clerk/react-router@8411

@clerk/shared

npm i https://pkg.pr.new/@clerk/shared@8411

@clerk/tanstack-react-start

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@clerk/ui

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@clerk/upgrade

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@clerk/vue

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commit: ea23f69

@jacekradko
jacekradko merged commit 115cf98 into mainApr 28, 2026
68 of 72 checks passed
@jacekradko
jacekradko deleted the jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac branch April 28, 2026 03:17
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@jacekradko@Ephem
, '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('^' + ".*" + '
Skip to content

fix(nextjs): Use constant-time comparison in assertTokenSignature - #8411

Merged
jacekradko merged 3 commits into
mainfrom
jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac
Apr 28, 2026
Merged

fix(nextjs): Use constant-time comparison in assertTokenSignature#8411
jacekradko merged 3 commits into
mainfrom
jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac

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Summary

  • Switches assertTokenSignature in @clerk/nextjs to a constant-time string comparison for the HMAC-SHA1 integrity signature on the middleware-to-origin auth header handoff.
  • The new constantTimeEqual helper is pure JS, synchronous, and runtime-agnostic so it works the same way in Node and in Edge Runtime (where node:crypto.timingSafeEqual isn't reliably available). The signature is a fixed-length 40-character hex digest, so the early length check leaks nothing secret.
  • Resolves AISEC-8.

Test plan

  • pnpm turbo build --filter=@clerk/nextjs succeeds
  • pnpm --filter=@clerk/nextjs test — all 36 test files / 195 tests pass, including a new src/server/__tests__/utils.test.ts covering match, missing, last-character mismatch, and length mismatch
  • pnpm --filter=@clerk/nextjs lint — no new warnings on touched files

The middleware-to-origin auth header integrity check now uses a
constant-time string compare. The helper is synchronous and
runtime-agnostic so it works in both Node and Edge Runtime.
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🦋 Changeset detected

Latest commit: ea23f69

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package
NameType
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Not sure what this means? Click here to learn what changesets are.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro

Run ID: f8bdb8fd-26e0-4408-a15a-613c67181fd6

📥 Commits

Reviewing files that changed from the base of the PR and between 8e75773 and ea23f69.

📒 Files selected for processing (1)
  • packages/nextjs/src/server/utils.ts

📝 Walkthrough

Walkthrough

A changeset is added for @clerk/nextjs (patch release). assertTokenSignature in packages/nextjs/src/server/utils.ts was changed to use a new constantTimeEqual helper for signature comparison (replacing a direct !== check) and still throws authSignatureInvalid on mismatch. A new test file packages/nextjs/src/server/__tests__/utils.test.ts exercises matching, missing (undefined/null/empty), tampered, truncated, and extended signatures.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check nameStatusExplanation
Title check✅ PassedThe title accurately describes the main change: replacing non-constant-time string comparison with constant-time comparison in assertTokenSignature.
Description check✅ PassedThe description provides clear context about the security fix, implementation details, and references the specific issue (AISEC-8) being resolved.
Docstring Coverage✅ PassedDocstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check✅ PassedCheck skipped because no linked issues were found for this pull request.
Out of Scope Changes check✅ PassedCheck skipped because no linked issues were found for this pull request.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.


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@clerk/chrome-extension

npm i https://pkg.pr.new/@clerk/chrome-extension@8411

@clerk/clerk-js

npm i https://pkg.pr.new/@clerk/clerk-js@8411

@clerk/dev-cli

npm i https://pkg.pr.new/@clerk/dev-cli@8411

@clerk/expo

npm i https://pkg.pr.new/@clerk/expo@8411

@clerk/expo-passkeys

npm i https://pkg.pr.new/@clerk/expo-passkeys@8411

@clerk/express

npm i https://pkg.pr.new/@clerk/express@8411

@clerk/fastify

npm i https://pkg.pr.new/@clerk/fastify@8411

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jacekradko merged commit 115cf98 into mainApr 28, 2026
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jacekradko deleted the jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac branch April 28, 2026 03:17
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fix(nextjs): Use constant-time comparison in assertTokenSignature - #8411

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jacekradko merged 3 commits into
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jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac
Apr 28, 2026
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fix(nextjs): Use constant-time comparison in assertTokenSignature#8411
jacekradko merged 3 commits into
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jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac

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Summary

  • Switches assertTokenSignature in @clerk/nextjs to a constant-time string comparison for the HMAC-SHA1 integrity signature on the middleware-to-origin auth header handoff.
  • The new constantTimeEqual helper is pure JS, synchronous, and runtime-agnostic so it works the same way in Node and in Edge Runtime (where node:crypto.timingSafeEqual isn't reliably available). The signature is a fixed-length 40-character hex digest, so the early length check leaks nothing secret.
  • Resolves AISEC-8.

Test plan

  • pnpm turbo build --filter=@clerk/nextjs succeeds
  • pnpm --filter=@clerk/nextjs test — all 36 test files / 195 tests pass, including a new src/server/__tests__/utils.test.ts covering match, missing, last-character mismatch, and length mismatch
  • pnpm --filter=@clerk/nextjs lint — no new warnings on touched files

The middleware-to-origin auth header integrity check now uses a
constant-time string compare. The helper is synchronous and
runtime-agnostic so it works in both Node and Edge Runtime.
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🦋 Changeset detected

Latest commit: ea23f69

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package
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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro

Run ID: f8bdb8fd-26e0-4408-a15a-613c67181fd6

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Reviewing files that changed from the base of the PR and between 8e75773 and ea23f69.

📒 Files selected for processing (1)
  • packages/nextjs/src/server/utils.ts

📝 Walkthrough

Walkthrough

A changeset is added for @clerk/nextjs (patch release). assertTokenSignature in packages/nextjs/src/server/utils.ts was changed to use a new constantTimeEqual helper for signature comparison (replacing a direct !== check) and still throws authSignatureInvalid on mismatch. A new test file packages/nextjs/src/server/__tests__/utils.test.ts exercises matching, missing (undefined/null/empty), tampered, truncated, and extended signatures.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check nameStatusExplanation
Title check✅ PassedThe title accurately describes the main change: replacing non-constant-time string comparison with constant-time comparison in assertTokenSignature.
Description check✅ PassedThe description provides clear context about the security fix, implementation details, and references the specific issue (AISEC-8) being resolved.
Docstring Coverage✅ PassedDocstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check✅ PassedCheck skipped because no linked issues were found for this pull request.
Out of Scope Changes check✅ PassedCheck skipped because no linked issues were found for this pull request.

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commit: ea23f69

@jacekradko
jacekradko merged commit 115cf98 into mainApr 28, 2026
68 of 72 checks passed
@jacekradko
jacekradko deleted the jacek/aisec-8-clerknextjs-asserttokensignature-non-constant-time-hmac branch April 28, 2026 03:17
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