CVE-2025-64718

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

13/11/2025

Last modified:

02/02/2026

Description

js-yaml is a JavaScript YAML parser and dumper. In js-yaml before 4.1.1 and 3.14.2, it&#39;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).

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS v3.1 Severity and Metrics:

Base Score: 5.30 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): Low
Availability (A): None

Base Score 3.x

5.30

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:nodeca:js-yaml::::::node.js::*		3.14.2 (excluding)
cpe:2.3:a:nodeca:js-yaml::::::node.js::*	4.0.0 (including)	4.1.1 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2025-64718

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools