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CVE-2025-64718

CVE-2025-64718 · js-yaml has prototype pollution in merge (<<)

This page contains facts from public vulnerability sources. Check the original advisory before updating.

js-yaml is a JavaScript YAML parser and dumper. In js-yaml before 4.1.1 and 3.14.2, 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 and 3.14.2. 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).

CVSS 5.3 · Medium · EPSS 0.4% · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • js-yaml

    Versions
    • >= 4.0.0, < 4.1.1: Affected
    • < 3.14.2: Affected

    No fix published

  • node-js-yaml Debian:12

    Versions
    • 4.1.0+dfsg+~4.0.5-7
    • 4.1.1+dfsg+~4.0.9-1
    • 4.2.0+~4.0.9-1
    • 4.2.0+~4.0.9-2
    • 4.3.2+~4.0.9-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-js-yaml Debian:13

    Versions
    • 4.1.0+dfsg+~4.0.5-7
    • 4.1.1+dfsg+~4.0.9-1
    • 4.2.0+~4.0.9-1
    • 4.2.0+~4.0.9-2
    • 4.3.2+~4.0.9-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-js-yaml Debian:14

    Versions
    • 4.1.0+dfsg+~4.0.5-7
    Affected ranges
    • ECOSYSTEM: < 4.1.1+dfsg+~4.0.9-1

    Update to 4.1.1+dfsg+~4.0.9-1

  • js-yaml npm

    Affected ranges
    • SEMVER: ≥ 4.0.0, < 4.1.1

    Update to 4.1.1

  • js-yaml npm

    Affected ranges
    • SEMVER: < 3.14.2

    Update to 3.14.2

  • node-js-yaml Ubuntu:18.04:LTS

    Versions
    • 3.9.1+dfsg-1
    • 3.10.0+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-js-yaml Ubuntu:20.04:LTS

    Versions
    • 3.13.1+dfsg-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-js-yaml Ubuntu:22.04:LTS

    Versions
    • 3.14.1+dfsg+~3.12.6-2
    • 4.1.0+dfsg+~4.0.5-4ubuntu1
    • 4.1.0+dfsg+~4.0.5-5
    • 4.1.0+dfsg+~4.0.5-6
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-js-yaml Ubuntu:24.04:LTS

    Versions
    • 4.1.0+dfsg+~4.0.5-7
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-js-yaml Ubuntu:25.10

    Versions
    • 4.1.0+dfsg+~4.0.5-7
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-js-yaml Ubuntu:26.10

    Versions
    • 4.1.1+dfsg+~4.0.9-1
    • 4.2.0+~4.0.9-1
    • 4.2.0+~4.0.9-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-js-yaml Ubuntu:26.04:LTS

    Versions
    • 4.1.0+dfsg+~4.0.5-7
    • 4.1.1+dfsg+~4.0.9-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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