CVE-2025-64718 – js-yaml has prototype pollution in merge (

CVE ID : CVE-2025-64718

Published : Nov. 13, 2025, 4:15 p.m. | 43 minutes ago

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).

Severity: 5.3 | MEDIUM

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