CVE-2025-64718js-yaml is a JavaScript YAML parser and dumper.
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No exploitation reported and no EPSS estimate yet.
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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 (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-1321
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Oct 7, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
nodeca js-yaml nodeca:js-yaml | before 3.14.2; from 4.0.0 before 4.1.1 | NVD |
References
- https://github.com/nodeca/js-yaml/commit/383665ff4248ec2192d1274e934462bb30426879patch
- https://github.com/nodeca/js-yaml/commit/5278870a17454fe8621dbd8c445c412529525266patch
- https://github.com/nodeca/js-yaml/issues/730#issuecomment-3549635876issue-tracking
- https://github.com/nodeca/js-yaml/security/advisories/GHSA-mh29-5h37-fv8mvendor-advisory
- https://github.com/advisories/GHSA-mh29-5h37-fv8mvendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.