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: 0.004 (34.0th 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
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
- af854a3a-2127-422b-91ae-364da2661108 (Vendor Advisory)
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.