Prototype Pollution in Nodeca Js-yaml
CVE-2025-64718
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 un…
Vulnerability class: Prototype Pollution
EPSS: 0.000 (10.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Nodeca Js-yaml — versions >= 4.0.0, < 4.1.1, < 3.14.2
Weakness classification (CWE)
References
- https://github.com/nodeca/js-yaml/security/advisories/GHSA-mh29-5h37-fv8m (x_refsource_CONFIRM)
- https://github.com/nodeca/js-yaml/issues/730#issuecomment-3549635876 (x_refsource_MISC)
- https://github.com/nodeca/js-yaml/commit/383665ff4248ec2192d1274e934462bb30426879 (x_refsource_MISC)
- https://github.com/nodeca/js-yaml/commit/5278870a17454fe8621dbd8c445c412529525266 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-64718?
- CVE-2025-64718 is a medium-severity vulnerability in Nodeca Js-yaml, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 5.3/10. Published 2025-11-13.
- How severe is CVE-2025-64718?
- Medium severity. CVSS v3 base score is 5.3 out of 10.