build(deps): bump js-yaml from 4.1.1 to 4.2.0

[dependabot]

Bumps js-yaml from 4.1.1 to 4.2.0.

Changelog

Sourced from js-yaml's changelog.

[4.2.0] - 2026-06-01

Added

• Added docs/safety.md with notes about processing untrusted YAML.
• Added maxDepth (100) loader option. Not a problem, but gives a better exception instead of RangeError on stack overflow.
• Added maxMergeSeqLength (20) loader option. Not a problem after merge fix, but an additional restriction for safety.
• Added sourcemaps to dist/ builds.

Changed

• Stop resolving numbers with underscores as numeric scalars, #627.
• Switched dev toolchains to Vite / neostandard.
• Updated demo.
• Reorganized tests.
• dist/ files are no longer kept in the repository.

Fixed

• Fix parsing of properties on the first implicit block mapping key, #62.
• Fix trailing whitespace handling when folding flow scalar lines, #307.
• Reject top-level block scalars without content indentation, #280.
• Ensure numbers survive round-trip, #737.
• Fix test coverage for issue #221.
• Fix flow scalar trailing whitespace folding, #307.
• Fix digits in YAML named tag handles.

Security

• Fix potential DoS via quadratic complexity in merge - deduplicate repeated elements (makes sense for malformed files > 10K).

[3.14.2] - 2025-11-15

Security

• Backported v4.1.1 fix to v3

Commits

• See full diff in compare view

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[cursor]

PR Summary

Medium Risk
Only lockfile/manifest changes, but js-yaml parses user-supplied OpenAPI YAML so minor version parsing and security behavior changes could affect edge-case specs.

Overview
Bumps the direct js-yaml dependency from ^4.1.0 (resolved 4.1.1) to ^4.2.0 in package.json and package-lock.json. No application source changes.

4.2.0 brings parser fixes and hardening used when loading OpenAPI and description YAML in openapi.ts and server.ts, including a DoS-related merge deduplication fix, new default loader limits (maxDepth, maxMergeSeqLength), and stricter parsing (e.g. numbers with underscores no longer treated as numeric scalars).

^{Reviewed by Cursor Bugbot for commit cc1a45f. Bugbot is set up for automated code reviews on this repo. Configure here.}

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	js-yaml@​4.1.1 ⏵ 4.2.0	-11	+2

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[socket-security]

Warning

Review the following alerts detected in dependencies.

According to your organization's Security Policy, it is recommended to resolve "Warn" alerts. Learn more about Socket for GitHub.

Action	Severity	Alert  (click "▶" to expand/collapse)
Warn		Obfuscated code: npm js-yaml is 90.0% likely obfuscated Confidence: 0.90 Location: Package overview From: package-lock.json → npm/js-yaml@4.2.0 ℹ Read more on: This package | This alert | What is obfuscated code? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Packages should not obfuscate their code. Consider not using packages with obfuscated code. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/js-yaml@4.2.0. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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