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🚨 [security] Update js-yaml 3.14.1 → 4.1.1 (major) #1678

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🚨 [security] Update js-yaml 3.14.1 → 4.1.1 (major) #1678

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@depfu depfu bot commented Nov 14, 2025

🚨 Your current dependencies have known security vulnerabilities 🚨

This dependency update fixes known security vulnerabilities. Please see the details below and assess their impact carefully. We recommend to merge and deploy this as soon as possible!

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ js-yaml (3.14.1 → 4.1.1) · Repo · Changelog

Security Advisories 🚨

🚨 js-yaml has prototype pollution in merge (<<)

Impact

In js-yaml 4.1.0 and below, it's possible for an attacker to modify the prototype of the result of a parsed yaml document via prototype pollution (__proto__). All users who parse untrusted yaml documents may be impacted.

Patches

Problem is patched in js-yaml 4.1.1.

Workarounds

You can protect against this kind of attack on the server by using node --disable-proto=delete or deno (in Deno, pollution protection is on by default).

References

https://cheatsheetseries.owasp.org/cheatsheets/Prototype_Pollution_Prevention_Cheat_Sheet.html

Release Notes

4.1.1 (from changelog)

Security

  • Fix prototype pollution issue in yaml merge (<<) operator.

4.1.0 (from changelog)

Added

  • Types are now exported as yaml.types.XXX.
  • Every type now has options property with original arguments kept as they were (see yaml.types.int.options as an example).

Changed

  • Schema.extend() now keeps old type order in case of conflicts (e.g. Schema.extend([ a, b, c ]).extend([ b, a, d ]) is now ordered as abcd instead of cbad).

4.0.0 (from changelog)

Changed

  • Check migration guide to see details for all breaking changes.
  • Breaking: "unsafe" tags !!js/function, !!js/regexp, !!js/undefined are moved to js-yaml-js-types package.
  • Breaking: removed safe* functions. Use load, loadAll, dump instead which are all now safe by default.
  • yaml.DEFAULT_SAFE_SCHEMA and yaml.DEFAULT_FULL_SCHEMA are removed, use yaml.DEFAULT_SCHEMA instead.
  • yaml.Schema.create(schema, tags) is removed, use schema.extend(tags) instead.
  • !!binary now always mapped to Uint8Array on load.
  • Reduced nesting of /lib folder.
  • Parse numbers according to YAML 1.2 instead of YAML 1.1 (01234 is now decimal, 0o1234 is octal, 1:23 is parsed as string instead of base60).
  • dump() no longer quotes :, [, ], (, ) except when necessary, #470, #557.
  • Line and column in exceptions are now formatted as (X:Y) instead of at line X, column Y (also present in compact format), #332.
  • Code snippet created in exceptions now contains multiple lines with line numbers.
  • dump() now serializes undefined as null in collections and removes keys with undefined in mappings, #571.
  • dump() with skipInvalid=true now serializes invalid items in collections as null.
  • Custom tags starting with ! are now dumped as !tag instead of !<!tag>, #576.
  • Custom tags starting with tag:yaml.org,2002: are now shorthanded using !!, #258.

Added

  • Added .mjs (es modules) support.
  • Added quotingType and forceQuotes options for dumper to configure string literal style, #290, #529.
  • Added styles: { '!!null': 'empty' } option for dumper (serializes { foo: null } as "foo: "), #570.
  • Added replacer option (similar to option in JSON.stringify), #339.
  • Custom Tag can now handle all tags or multiple tags with the same prefix, #385.

Fixed

  • Astral characters are no longer encoded by dump(), #587.
  • "duplicate mapping key" exception now points at the correct column, #452.
  • Extra commas in flow collections (e.g. [foo,,bar]) now throw an exception instead of producing null, #321.
  • __proto__ key no longer overrides object prototype, #164.
  • Removed bower.json.
  • Tags are now url-decoded in load() and url-encoded in dump() (previously usage of custom non-ascii tags may have led to invalid YAML that can't be parsed).
  • Anchors now work correctly with empty nodes, #301.
  • Fix incorrect parsing of invalid block mapping syntax, #418.
  • Throw an error if block sequence/mapping indent contains a tab, #80.

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by more commits than we can show here.

✳️ @​babel/plugin-transform-modules-commonjs (7.18.6 → 7.27.1) · Repo · Changelog

Release Notes

Too many releases to show here. View the full release notes.

Commits

See the full diff on Github. The new version differs by 63 commits:

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