Bump js-yaml from 4.1.0 to 4.2.0

DE
4mo ago
+13-387

Bumps js-yaml from 4.1.0 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

[4.1.1] - 2025-11-12

Security

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

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Summary by cubic

Upgrade js-yaml to 4.2.0 for security hardening and stricter, more predictable YAML parsing. This adds safer loader defaults and fixes several parsing edge cases.

  • Dependencies

    • Bumped js-yaml 4.1.0 → 4.2.0.
    • Includes security fixes (merge DoS/prototype pollution), new loader limits (maxDepth 100, maxMergeSeqLength 20), and no longer treats numbers with underscores as numeric scalars.

  • Migration

    • YAML values like 1_000 now parse as strings; update data or normalize after parsing if needed.
    • For very deep or large merged YAML, raise maxDepth/maxMergeSeqLength via loader options if you hit limits.