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Vulnerability record · CVE-2025-64718 · published 13 November 2025

CVE-2025-64718: Nodeca js-yaml prototype pollution vulnerability

Nodeca · Js Yaml

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).

5.3 CVSS 3.1 Medium EPSS 0.41% · top 67.5% CWE-1321 · Prototype pollution
5.3CVSS 3.1 base score
0.41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

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).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/nodeca/js-yaml/commit/383665ff4248ec2192d1274e934462bb30426879 Patch
https://github.com/nodeca/js-yaml/commit/5278870a17454fe8621dbd8c445c412529525266 Patch
https://github.com/nodeca/js-yaml/issues/730#issuecomment-3549635876 Issue Tracking
https://github.com/nodeca/js-yaml/security/advisories/GHSA-mh29-5h37-fv8m Vendor Advisory
https://github.com/advisories/GHSA-mh29-5h37-fv8m Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-64718), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.