Sourced from esbuild's releases.

v0.28.1

• Disallow \ in local development server HTTP requests (GHSA-g7r4-m6w7-qqqr)

  This release fixes a security issue where HTTP requests to esbuild's local development server could traverse outside of the serve directory on Windows using a \ backslash character. It happened due to the use of Go's path.Clean() function, which only handles Unix-style / characters. HTTP requests with paths containing \ are no longer allowed.

  Thanks to @​dellalibera for reporting this issue.

• Add integrity checks to the Deno API (GHSA-gv7w-rqvm-qjhr)

  The previous release of esbuild added integrity checks to esbuild's npm install script. This release also adds integrity checks to esbuild's Deno install script. Now esbuild's Deno API will also fail with an error if the downloaded esbuild binary contains something other than the expected content.

  Note that esbuild's Deno API installs from registry.npmjs.org by default, but allows the NPM_CONFIG_REGISTRY environment variable to override this with a custom package registry. This change means that the esbuild executable served by NPM_CONFIG_REGISTRY must now match the expected content.

  Thanks to @​sondt99 for reporting this issue.

• Avoid inlining using and await using declarations (#4482)

  Previously esbuild's minifier sometimes incorrectly inlined using and await using declarations into subsequent uses of that declaration, which then fails to dispose of the resource correctly. This bug happened because inlining was done for let and const declarations by avoiding doing it for var declarations, which no longer worked when more declaration types were added. Here's an example:

  // Original code
  {
    using x = new Resource()
    x.activate()
  }
  // Old output (with --minify)
  new Resource().activate();
  // New output (with --minify)
  {using e=new Resource;e.activate()}

• Fix module evaluation when an error is thrown (#4461, #4467)

  If an error is thrown during module evaluation, esbuild previously didn't preserve the state of the module for subsequent module references. This was observable if import() or require() is used to import a module multiple times. The thrown error is supposed to be thrown by every call to import() or require(), not just the first. With this release, esbuild will now throw the same error every time you call import() or require() on a module that throws during its evaluation.

• Fix some edge cases around the new operator (#4477)

  Previously esbuild incorrectly printed certain edge cases involving complex expressions inside the target of a new expression (specifically an optional chain and/or a tagged template literal). The generated code for the new target was not correctly wrapped with parentheses, and either contained a syntax error or had different semantics. These edge cases have been fixed so that they now correctly wrap the new target in parentheses. Here is an example of some affected code:

  // Original code
  new (foo()`bar`)()
  new (foo()?.bar)()
  // Old output
  new foo()bar();
  new (foo())?.bar();

... (truncated)

Sourced from esbuild's changelog.

0.28.1

• Disallow \ in local development server HTTP requests (GHSA-g7r4-m6w7-qqqr)

  This release fixes a security issue where HTTP requests to esbuild's local development server could traverse outside of the serve directory on Windows using a \ backslash character. It happened due to the use of Go's path.Clean() function, which only handles Unix-style / characters. HTTP requests with paths containing \ are no longer allowed.

  Thanks to @​dellalibera for reporting this issue.

• Add integrity checks to the Deno API (GHSA-gv7w-rqvm-qjhr)

  The previous release of esbuild added integrity checks to esbuild's npm install script. This release also adds integrity checks to esbuild's Deno install script. Now esbuild's Deno API will also fail with an error if the downloaded esbuild binary contains something other than the expected content.

  Note that esbuild's Deno API installs from registry.npmjs.org by default, but allows the NPM_CONFIG_REGISTRY environment variable to override this with a custom package registry. This change means that the esbuild executable served by NPM_CONFIG_REGISTRY must now match the expected content.

  Thanks to @​sondt99 for reporting this issue.

• Avoid inlining using and await using declarations (#4482)

  Previously esbuild's minifier sometimes incorrectly inlined using and await using declarations into subsequent uses of that declaration, which then fails to dispose of the resource correctly. This bug happened because inlining was done for let and const declarations by avoiding doing it for var declarations, which no longer worked when more declaration types were added. Here's an example:

  // Original code
  {
    using x = new Resource()
    x.activate()
  }
  // Old output (with --minify)
  new Resource().activate();
  // New output (with --minify)
  {using e=new Resource;e.activate()}

• Fix module evaluation when an error is thrown (#4461, #4467)

  If an error is thrown during module evaluation, esbuild previously didn't preserve the state of the module for subsequent module references. This was observable if import() or require() is used to import a module multiple times. The thrown error is supposed to be thrown by every call to import() or require(), not just the first. With this release, esbuild will now throw the same error every time you call import() or require() on a module that throws during its evaluation.

• Fix some edge cases around the new operator (#4477)

  Previously esbuild incorrectly printed certain edge cases involving complex expressions inside the target of a new expression (specifically an optional chain and/or a tagged template literal). The generated code for the new target was not correctly wrapped with parentheses, and either contained a syntax error or had different semantics. These edge cases have been fixed so that they now correctly wrap the new target in parentheses. Here is an example of some affected code:

  // Original code
  new (foo()`bar`)()
  new (foo()?.bar)()
  // Old output
  new foo()bar();
  new (foo())?.bar();

... (truncated)

• bb9db84 publish 0.28.1 to npm
• 9ff053e security: add integrity checks to the Deno API
• 0a9bf21 enforce non-negative size in gzip parser
• e2a1a71 security: forbid \\ in local dev server requests
• 83a2cbf fix #4482: don't inline using declarations
• 308ad74 fix #4471: renaming of nested var declarations
• f013f5f fix some typos
• aafd6e4 chore: fix some minor issues in comments (#4462)
• 15300c3 follow up: cjs evaluation fixes
• 1bda0c3 fix #4461, fix #4467: esm evaluation fixes
• Additional commits viewable in compare view

Sourced from undici's releases.

v8.5.0

⚠️ Security Release

This release line addresses 8 security advisories. Most are fixed in v8.5.0; the SOCKS5 pool-reuse issue was fixed earlier in v8.2.0.

Action required: Upgrade to undici 8.5.0 or later.

npm install undici@^8.5.0

Summary

Advisory	CVE	Severity (CVSS)	Fixed in	Fix commit
GHSA-vxpw-j846-p89q	CVE-2026-12151	High (7.5)	8.5.0	32dbf0b3
GHSA-38rv-x7px-6hhq	CVE-2026-9675	High (7.5)	8.5.0	b4c287b3
GHSA-vmh5-mc38-953g	CVE-2026-9697	High (7.4)	8.5.0	42d49559
GHSA-hm92-r4w5-c3mj	CVE-2026-6734	High (7.5)	8.2.0	a516f870
GHSA-pr7r-676h-xcf6	CVE-2026-9678	Moderate (5.9)	8.5.0	cb105d7c
GHSA-p88m-4jfj-68fv	CVE-2026-9679	Moderate (5.9)	8.5.0	5655ea43
GHSA-g8m3-5g58-fq7m	CVE-2026-11525	Low (3.7)	8.5.0	5655ea43
GHSA-35p6-xmwp-9g52	CVE-2026-6733	Low (3.7)	8.5.0	6ea54ef8

---

High severity

WebSocket DoS via fragment count bypass — CVE-2026-12151

GHSA-vxpw-j846-p89q · CWE-400, CWE-770 Fix: 32dbf0b3 websocket: limit the number of fragments in a message (also c5ed7875 handle empty fragments and stream limits)

A malicious WebSocket server can stream a large number of small or empty continuation frames. Undici enforced a limit on cumulative payload size but did not limit the number of fragments per message, leading to unbounded memory growth and denial of service.

• Affected: applications using new WebSocket(...) or WebSocketStream against untrusted endpoints.
• Workaround: none — upgrade is required.

WebSocket DoS via cumulative fragment bypass — CVE-2026-9675

GHSA-38rv-x7px-6hhq · CWE-400, CWE-770 Fix: b4c287b3 fix(websocket): enforce max payload size across fragments

Undici validated the size of individual frames but did not track cumulative size across a fragmented message. An attacker could send many small fragments that each pass per-frame validation but collectively exceed the configured limit, causing memory exhaustion. This is a regression introduced in 8.1.0 (the

... (truncated)

• a0806e1 Bumped v8.5.0 (#5429)
• 8a0392c test: detect available python command in wpt runner (#5427)
• f4045b9 ci: increase Node.js workflow timeout (#5426)
• 363e44f chore: removed repro-h2-pipelining-default.mjs and lint (#5420)
• c5ed787 websocket: handle empty fragments and stream limits
• e114e77 align EventSource with spec (#5418)
• 6df53c5 fix: preserve h2 queue on out-of-order completion (#5410)
• 32dbf0b websocket: limit the number of fragments in a message
• 0d6ecc5 add bodymixin.textStream() (#5416)
• 42d4955 fix: honor requestTls when proxy is SOCKS5
• Additional commits viewable in compare view

Sourced from yaml's releases.

v2.9.0

The changes here are really only patches, but I'm releasing this as a minor version to note a small change to the documentation of parseDocument() and parseAllDocuments(): I've removed the claim that they'll "never throw".

It remains the case that practically all non-malicious inputs will be handled without emitting an error, but there is a decent chance that code paths remain where e.g. a RangeError due to call stack exhaustion can be triggered by malicious inputs. Up to now, I've considered these as security vulnerabilities, and in fact it's the only category of error for which yaml CVEs have been issued so far.

Starting from this release, I'll be considering such errors as bugs, but not vulnerabilities. I do welcome people and/or LLMs looking for them, but please report them as normal issues rather than suspected security vulnerabilities. This also applies to previously undiscovered bugs in earlier releases.

• fix: Avoid calling Array.prototype.push.apply() with large source array
• fix(lexer): Avoid recursive calls that may exhaust the call stack

• ddb21b0 2.9.0
• 167365b docs: Clarify that not all errors can be avoided
• 6eca2a7 fix: Avoid calling Array.prototype.push.apply() with large source array
• 0543cd5 fix(lexer): Avoid recursive calls that may exhaust the call stack
• See full diff in compare view

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