# CVE-2025-64718: node-js-yaml: js-yaml is a JavaScript YAML parser and dumper

CVE-2025-64718 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2025-64718, released November 13, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-64718
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0042
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 13, 2025

## Description

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).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | cockpit-repos opensuse-leap 16.0 | 4.7-160000.1.1 | [OPENSUSE-SU-2026:20251-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20251-1.md) | Feb 18, 2026 |
| Linux | cockpit-repos sles 16.0 | 4.7-160000.1.1 | [SUSE-SU-2026:20580-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20580-1.md) | Feb 18, 2026 |
| Linux | cockpit-subscriptions opensuse-leap 16.0 | 12.1-160000.1.1 | [OPENSUSE-SU-2026:20117-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20117-1.md) | Jan 27, 2026 |
| Linux | cockpit-subscriptions sles 16.0 | 12.1-160000.1.1 | [SUSE-SU-2026:20182-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20182-1.md) | Jan 27, 2026 |
| Linux | node-js-yaml Debian 14 | 4.1.1+dfsg+~4.0.9-1 | [DEBIAN-CVE-2025-64718](https://patchblox.com/security/data/fix/linux/debian-cve-2025-64718.md) | Nov 13, 2025 |
| Linux | yarnpkg Fedora 43 | 1.22.22-18.fc43 | [FEDORA-2026-085ABEEA02](https://patchblox.com/security/data/fix/linux/fedora-2026-085abeea02.md) | Apr 2, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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