tls.connect() aborts process on malformed ALPNProtocols instead of throwing an error #65069

Closed
#65076
Closed
tls.connect() aborts process on malformed ALPNProtocols instead of throwing an error#65069
#65076

Description

@brown-sussy
brown-sussy
opened on Aug 6, 2026

Version

v26.7.0

Platform

Darwin MacBook-Pro-2.local 25.0.0 Darwin Kernel Version 25.0.0: Tue Aug 5 22:46:55 PDT 2025; root:xnu-12377.1.6~5/RELEASE_ARM64_T6000 arm64
(bas

Subsystem

No response

What steps will reproduce the bug?

Run the following command:

node -e "require('node:tls').connect({ host: '127.0.0.1', port: 9999, ALPNProtocols: [''] })"

The process aborts with SIGABRT.

The same issue can be reproduced with malformed ALPN wire format buffers:

Buffer.from([0])Buffer.from([2,0x61])Buffer.from([1,0x61,0x62])

passed as ALPNProtocols.

How often does it reproduce? Is there a required condition?

It reproduces consistently (100% of the time).

Required condition:

  • Node.js TLS client API is used through tls.connect();
  • ALPNProtocols contains an invalid ALPN protocol list;
  • The invalid input reaches the native TLS implementation.

No network interaction is required.

What is the expected behavior? Why is that the expected behavior?

The expected behavior is that Node.js rejects the invalid input by throwing a JavaScript exception (for example ERR_INVALID_ARG_VALUE) instead of terminating the process.

ALPNProtocols is a documented API option supporting string arrays and Buffer/Uint8Array inputs. Invalid values should be handled as invalid arguments and remain recoverable application errors.

What do you see instead?

The entire Node.js process aborts.

The failure occurs in TLSWrap::SetALPNProtocols():

CHECK_EQ(0, SSL_set_alpn_protos(ssl, protos.data(), protos.length()));

When OpenSSL rejects the malformed ALPN list, the CHECK assertion fails and Node exits with SIGABRT (exit code 134).

Additional information

No response

Activity

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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
      tls.connect() aborts process on malformed ALPNProtocols instead of throwing an error #65069
      Closed
      #65076
      Closed
      tls.connect() aborts process on malformed ALPNProtocols instead of throwing an error#65069
      #65076
      Description
      @brown-sussy
      brown-sussy
      opened on Aug 6, 2026
      Version
      v26.7.0
      Platform
      Darwin MacBook-Pro-2.local 25.0.0 Darwin Kernel Version 25.0.0: Tue Aug 5 22:46:55 PDT 2025; root:xnu-12377.1.6~5/RELEASE_ARM64_T6000 arm64
(bas

      Subsystem
      No response
      What steps will reproduce the bug?
      Run the following command:
      node -e "require('node:tls').connect({ host: '127.0.0.1', port: 9999, ALPNProtocols: [''] })"
      The process aborts with SIGABRT.
      The same issue can be reproduced with malformed ALPN wire format buffers:
      Buffer.from([0])Buffer.from([2,0x61])Buffer.from([1,0x61,0x62])
      passed as ALPNProtocols.
      How often does it reproduce? Is there a required condition?
      It reproduces consistently (100% of the time).
      Required condition:
      • Node.js TLS client API is used through tls.connect();
      • ALPNProtocols contains an invalid ALPN protocol list;
      • The invalid input reaches the native TLS implementation.
      No network interaction is required.
      What is the expected behavior? Why is that the expected behavior?
      The expected behavior is that Node.js rejects the invalid input by throwing a JavaScript exception (for example ERR_INVALID_ARG_VALUE) instead of terminating the process.
      ALPNProtocols is a documented API option supporting string arrays and Buffer/Uint8Array inputs. Invalid values should be handled as invalid arguments and remain recoverable application errors.
      What do you see instead?
      The entire Node.js process aborts.
      The failure occurs in TLSWrap::SetALPNProtocols():
      CHECK_EQ(0, SSL_set_alpn_protos(ssl, protos.data(), protos.length()));
      When OpenSSL rejects the malformed ALPN list, the CHECK assertion fails and Node exits with SIGABRT (exit code 134).
      Additional information
      No response
      Activity
      Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
        No labels
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          No milestone
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          None yet
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          No branches or pull requests
          Issue actions
          
, '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
          tls.connect() aborts process on malformed ALPNProtocols instead of throwing an error #65069
          Closed
          #65076
          Closed
          tls.connect() aborts process on malformed ALPNProtocols instead of throwing an error#65069
          #65076
          Description
          @brown-sussy
          brown-sussy
          opened on Aug 6, 2026
          Version
          v26.7.0
          Platform
          Darwin MacBook-Pro-2.local 25.0.0 Darwin Kernel Version 25.0.0: Tue Aug 5 22:46:55 PDT 2025; root:xnu-12377.1.6~5/RELEASE_ARM64_T6000 arm64
(bas

          Subsystem
          No response
          What steps will reproduce the bug?
          Run the following command:
          node -e "require('node:tls').connect({ host: '127.0.0.1', port: 9999, ALPNProtocols: [''] })"
          The process aborts with SIGABRT.
          The same issue can be reproduced with malformed ALPN wire format buffers:
          Buffer.from([0])Buffer.from([2,0x61])Buffer.from([1,0x61,0x62])
          passed as ALPNProtocols.
          How often does it reproduce? Is there a required condition?
          It reproduces consistently (100% of the time).
          Required condition:
          • Node.js TLS client API is used through tls.connect();
          • ALPNProtocols contains an invalid ALPN protocol list;
          • The invalid input reaches the native TLS implementation.
          No network interaction is required.
          What is the expected behavior? Why is that the expected behavior?
          The expected behavior is that Node.js rejects the invalid input by throwing a JavaScript exception (for example ERR_INVALID_ARG_VALUE) instead of terminating the process.
          ALPNProtocols is a documented API option supporting string arrays and Buffer/Uint8Array inputs. Invalid values should be handled as invalid arguments and remain recoverable application errors.
          What do you see instead?
          The entire Node.js process aborts.
          The failure occurs in TLSWrap::SetALPNProtocols():
          CHECK_EQ(0, SSL_set_alpn_protos(ssl, protos.data(), protos.length()));
          When OpenSSL rejects the malformed ALPN list, the CHECK assertion fails and Node exits with SIGABRT (exit code 134).
          Additional information
          No response
          Activity
          Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            No labels
            No labels
            Type
            No type
            Projects
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              Milestone
              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, '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
              tls.connect() aborts process on malformed ALPNProtocols instead of throwing an error #65069
              Closed
              #65076
              Closed
              tls.connect() aborts process on malformed ALPNProtocols instead of throwing an error#65069
              #65076
              Description
              @brown-sussy
              brown-sussy
              opened on Aug 6, 2026
              Version
              v26.7.0
              Platform
              Darwin MacBook-Pro-2.local 25.0.0 Darwin Kernel Version 25.0.0: Tue Aug 5 22:46:55 PDT 2025; root:xnu-12377.1.6~5/RELEASE_ARM64_T6000 arm64
(bas

              Subsystem
              No response
              What steps will reproduce the bug?
              Run the following command:
              node -e "require('node:tls').connect({ host: '127.0.0.1', port: 9999, ALPNProtocols: [''] })"
              The process aborts with SIGABRT.
              The same issue can be reproduced with malformed ALPN wire format buffers:
              Buffer.from([0])Buffer.from([2,0x61])Buffer.from([1,0x61,0x62])
              passed as ALPNProtocols.
              How often does it reproduce? Is there a required condition?
              It reproduces consistently (100% of the time).
              Required condition:
              • Node.js TLS client API is used through tls.connect();
              • ALPNProtocols contains an invalid ALPN protocol list;
              • The invalid input reaches the native TLS implementation.
              No network interaction is required.
              What is the expected behavior? Why is that the expected behavior?
              The expected behavior is that Node.js rejects the invalid input by throwing a JavaScript exception (for example ERR_INVALID_ARG_VALUE) instead of terminating the process.
              ALPNProtocols is a documented API option supporting string arrays and Buffer/Uint8Array inputs. Invalid values should be handled as invalid arguments and remain recoverable application errors.
              What do you see instead?
              The entire Node.js process aborts.
              The failure occurs in TLSWrap::SetALPNProtocols():
              CHECK_EQ(0, SSL_set_alpn_protos(ssl, protos.data(), protos.length()));
              When OpenSSL rejects the malformed ALPN list, the CHECK assertion fails and Node exits with SIGABRT (exit code 134).
              Additional information
              No response
              Activity
              Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                No labels
                No labels
                Type
                No type
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions
                  
, '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
                  tls.connect() aborts process on malformed ALPNProtocols instead of throwing an error #65069
                  Closed
                  #65076
                  Closed
                  tls.connect() aborts process on malformed ALPNProtocols instead of throwing an error#65069
                  #65076
                  Description
                  @brown-sussy
                  brown-sussy
                  opened on Aug 6, 2026
                  Version
                  v26.7.0
                  Platform
                  Darwin MacBook-Pro-2.local 25.0.0 Darwin Kernel Version 25.0.0: Tue Aug 5 22:46:55 PDT 2025; root:xnu-12377.1.6~5/RELEASE_ARM64_T6000 arm64
(bas

                  Subsystem
                  No response
                  What steps will reproduce the bug?
                  Run the following command:
                  node -e "require('node:tls').connect({ host: '127.0.0.1', port: 9999, ALPNProtocols: [''] })"
                  The process aborts with SIGABRT.
                  The same issue can be reproduced with malformed ALPN wire format buffers:
                  Buffer.from([0])Buffer.from([2,0x61])Buffer.from([1,0x61,0x62])
                  passed as ALPNProtocols.
                  How often does it reproduce? Is there a required condition?
                  It reproduces consistently (100% of the time).
                  Required condition:
                  • Node.js TLS client API is used through tls.connect();
                  • ALPNProtocols contains an invalid ALPN protocol list;
                  • The invalid input reaches the native TLS implementation.
                  No network interaction is required.
                  What is the expected behavior? Why is that the expected behavior?
                  The expected behavior is that Node.js rejects the invalid input by throwing a JavaScript exception (for example ERR_INVALID_ARG_VALUE) instead of terminating the process.
                  ALPNProtocols is a documented API option supporting string arrays and Buffer/Uint8Array inputs. Invalid values should be handled as invalid arguments and remain recoverable application errors.
                  What do you see instead?
                  The entire Node.js process aborts.
                  The failure occurs in TLSWrap::SetALPNProtocols():
                  CHECK_EQ(0, SSL_set_alpn_protos(ssl, protos.data(), protos.length()));
                  When OpenSSL rejects the malformed ALPN list, the CHECK assertion fails and Node exits with SIGABRT (exit code 134).
                  Additional information
                  No response
                  Activity
                  Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    No labels
                    No labels
                    Type
                    No type
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, '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
                      tls.connect() aborts process on malformed ALPNProtocols instead of throwing an error #65069
                      Closed
                      #65076
                      Closed
                      tls.connect() aborts process on malformed ALPNProtocols instead of throwing an error#65069
                      #65076
                      Description
                      @brown-sussy
                      brown-sussy
                      opened on Aug 6, 2026
                      Version
                      v26.7.0
                      Platform
                      Darwin MacBook-Pro-2.local 25.0.0 Darwin Kernel Version 25.0.0: Tue Aug 5 22:46:55 PDT 2025; root:xnu-12377.1.6~5/RELEASE_ARM64_T6000 arm64
(bas

                      Subsystem
                      No response
                      What steps will reproduce the bug?
                      Run the following command:
                      node -e "require('node:tls').connect({ host: '127.0.0.1', port: 9999, ALPNProtocols: [''] })"
                      The process aborts with SIGABRT.
                      The same issue can be reproduced with malformed ALPN wire format buffers:
                      Buffer.from([0])Buffer.from([2,0x61])Buffer.from([1,0x61,0x62])
                      passed as ALPNProtocols.
                      How often does it reproduce? Is there a required condition?
                      It reproduces consistently (100% of the time).
                      Required condition:
                      • Node.js TLS client API is used through tls.connect();
                      • ALPNProtocols contains an invalid ALPN protocol list;
                      • The invalid input reaches the native TLS implementation.
                      No network interaction is required.
                      What is the expected behavior? Why is that the expected behavior?
                      The expected behavior is that Node.js rejects the invalid input by throwing a JavaScript exception (for example ERR_INVALID_ARG_VALUE) instead of terminating the process.
                      ALPNProtocols is a documented API option supporting string arrays and Buffer/Uint8Array inputs. Invalid values should be handled as invalid arguments and remain recoverable application errors.
                      What do you see instead?
                      The entire Node.js process aborts.
                      The failure occurs in TLSWrap::SetALPNProtocols():
                      CHECK_EQ(0, SSL_set_alpn_protos(ssl, protos.data(), protos.length()));
                      When OpenSSL rejects the malformed ALPN list, the CHECK assertion fails and Node exits with SIGABRT (exit code 134).
                      Additional information
                      No response
                      Activity
                      Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        No labels
                        No labels
                        Type
                        No type
                        Projects
                        No projects
                          Milestone
                          No milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, '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
                          tls.connect() aborts process on malformed ALPNProtocols instead of throwing an error #65069
                          Closed
                          #65076
                          Closed
                          tls.connect() aborts process on malformed ALPNProtocols instead of throwing an error#65069
                          #65076
                          Description
                          @brown-sussy
                          brown-sussy
                          opened on Aug 6, 2026
                          Version
                          v26.7.0
                          Platform
                          Darwin MacBook-Pro-2.local 25.0.0 Darwin Kernel Version 25.0.0: Tue Aug 5 22:46:55 PDT 2025; root:xnu-12377.1.6~5/RELEASE_ARM64_T6000 arm64
(bas

                          Subsystem
                          No response
                          What steps will reproduce the bug?
                          Run the following command:
                          node -e "require('node:tls').connect({ host: '127.0.0.1', port: 9999, ALPNProtocols: [''] })"
                          The process aborts with SIGABRT.
                          The same issue can be reproduced with malformed ALPN wire format buffers:
                          Buffer.from([0])Buffer.from([2,0x61])Buffer.from([1,0x61,0x62])
                          passed as ALPNProtocols.
                          How often does it reproduce? Is there a required condition?
                          It reproduces consistently (100% of the time).
                          Required condition:
                          • Node.js TLS client API is used through tls.connect();
                          • ALPNProtocols contains an invalid ALPN protocol list;
                          • The invalid input reaches the native TLS implementation.
                          No network interaction is required.
                          What is the expected behavior? Why is that the expected behavior?
                          The expected behavior is that Node.js rejects the invalid input by throwing a JavaScript exception (for example ERR_INVALID_ARG_VALUE) instead of terminating the process.
                          ALPNProtocols is a documented API option supporting string arrays and Buffer/Uint8Array inputs. Invalid values should be handled as invalid arguments and remain recoverable application errors.
                          What do you see instead?
                          The entire Node.js process aborts.
                          The failure occurs in TLSWrap::SetALPNProtocols():
                          CHECK_EQ(0, SSL_set_alpn_protos(ssl, protos.data(), protos.length()));
                          When OpenSSL rejects the malformed ALPN list, the CHECK assertion fails and Node exits with SIGABRT (exit code 134).
                          Additional information
                          No response
                          Activity
                          Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
                            Labels
                            No labels
                            No labels
                            Type
                            No type
                            Projects
                            No projects
                              Milestone
                              No milestone
                              Relationships
                              None yet
                              Development
                              No branches or pull requests
                              Issue actions
                              
, '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); }
})();
})();

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                              tls.connect() aborts process on malformed ALPNProtocols instead of throwing an error #65069
                              Closed
                              #65076
                              Closed
                              tls.connect() aborts process on malformed ALPNProtocols instead of throwing an error#65069
                              #65076
                              Description
                              @brown-sussy
                              brown-sussy
                              opened on Aug 6, 2026
                              Version
                              v26.7.0
                              Platform
                              Darwin MacBook-Pro-2.local 25.0.0 Darwin Kernel Version 25.0.0: Tue Aug 5 22:46:55 PDT 2025; root:xnu-12377.1.6~5/RELEASE_ARM64_T6000 arm64
(bas

                              Subsystem
                              No response
                              What steps will reproduce the bug?
                              Run the following command:
                              node -e "require('node:tls').connect({ host: '127.0.0.1', port: 9999, ALPNProtocols: [''] })"
                              The process aborts with SIGABRT.
                              The same issue can be reproduced with malformed ALPN wire format buffers:
                              Buffer.from([0])Buffer.from([2,0x61])Buffer.from([1,0x61,0x62])
                              passed as ALPNProtocols.
                              How often does it reproduce? Is there a required condition?
                              It reproduces consistently (100% of the time).
                              Required condition:
                              • Node.js TLS client API is used through tls.connect();
                              • ALPNProtocols contains an invalid ALPN protocol list;
                              • The invalid input reaches the native TLS implementation.
                              No network interaction is required.
                              What is the expected behavior? Why is that the expected behavior?
                              The expected behavior is that Node.js rejects the invalid input by throwing a JavaScript exception (for example ERR_INVALID_ARG_VALUE) instead of terminating the process.
                              ALPNProtocols is a documented API option supporting string arrays and Buffer/Uint8Array inputs. Invalid values should be handled as invalid arguments and remain recoverable application errors.
                              What do you see instead?
                              The entire Node.js process aborts.
                              The failure occurs in TLSWrap::SetALPNProtocols():
                              CHECK_EQ(0, SSL_set_alpn_protos(ssl, protos.data(), protos.length()));
                              When OpenSSL rejects the malformed ALPN list, the CHECK assertion fails and Node exits with SIGABRT (exit code 134).
                              Additional information
                              No response
                              Activity
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