CVE-2025-64718
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
13/11/2025
Last modified:
14/11/2025
Description
js-yaml is a JavaScript YAML parser and dumper. In js-yaml 4.1.0 and below, 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. 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).
Impact
Base Score 3.x
5.30
Severity 3.x
MEDIUM