CVE-2025-64718 (Medium) detected in js-yaml-4.1.0.tgz, js-yaml-3.14.1.tgz

[mend-bolt-for-github]

CVE-2025-64718 - Medium Severity Vulnerability

Vulnerable Libraries - js-yaml-4.1.0.tgz, js-yaml-3.14.1.tgz

js-yaml-4.1.0.tgz

YAML 1.2 parser and serializer

Library home page: https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.0.tgz

Path to dependency file: /package.json

Path to vulnerable library: /node_modules/eslint/node_modules/js-yaml/package.json,/node_modules/@eslint/eslintrc/node_modules/js-yaml/package.json

Dependency Hierarchy:

• eslint-8.3.0.tgz (Root Library)
  • ❌ js-yaml-4.1.0.tgz (Vulnerable Library)

js-yaml-3.14.1.tgz

YAML 1.2 parser and serializer

Library home page: https://registry.npmjs.org/js-yaml/-/js-yaml-3.14.1.tgz

Path to dependency file: /package.json

Path to vulnerable library: /node_modules/js-yaml/package.json

Dependency Hierarchy:

• build-angular-13.0.3.tgz (Root Library)
  • babel-plugin-istanbul-6.1.1.tgz
    • load-nyc-config-1.1.0.tgz
      • ❌ js-yaml-3.14.1.tgz (Vulnerable Library)

Found in HEAD commit: 977ea6ccaaf2045985ee40cacd5f6d676fa1a047

Found in base branch: master

Vulnerability Details

js-yaml is a JavaScript YAML parser and dumper. 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. The problem is patched in js-yaml 4.1.1. Users 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).

Publish Date: 2025-11-13

URL: CVE-2025-64718

CVSS 3 Score Details (5.3)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: Low
  • Availability Impact: None

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-mh29-5h37-fv8m

Release Date: 2025-11-13

Fix Resolution: js-yaml - 4.1.1,js-yaml - 3.14.2

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