CVE-2025-64718

5.3 MEDIUM
Published: November 13, 2025 Modified: February 02, 2026
View on 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).

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/nodeca/js-yaml/issues/730#issuecomment-3549635876
Source: security-advisories@github.com
Issue Tracking
https://github.com/nodeca/js-yaml/security/advisories/GHSA-mh29-5h37-fv8m
Source: security-advisories@github.com
Vendor Advisory
https://github.com/advisories/GHSA-mh29-5h37-fv8m
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory

5 reference(s) from NVD

Quick Stats

CVSS v3 Score
5.3 / 10.0
EPSS (Exploit Probability)
0.0%
6th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

nodeca