CVE-2025-64718

MEDIUM EPSS 28.8%
Published Nov 13, 20257mo ago · Modified Jun 17, 20262w ago
5.3 CVSS 3.1
Medium
Find Similar
Published Nov 13, 2025 7mo ago
Last Modified Jun 17, 2026 2w ago

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).

CVSS Details

Base Score
5.3
Exploitability
3.9
Impact
1.4
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
28.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-1321

Affected Products 2

VendorProductVersionRange
nodecajs-yaml* <3.14.2
nodecajs-yaml*≥4.0.0  –  <4.1.1

References 5

  • github.com https://github.com/advisories/GHSA-mh29-5h37-fv8m
    Vendor Advisory
  • github.com https://github.com/nodeca/js-yaml/commit/383665ff4248ec2192d1274e934462bb30426879
    Patch
  • github.com https://github.com/nodeca/js-yaml/commit/5278870a17454fe8621dbd8c445c412529525266
    Patch
  • github.com https://github.com/nodeca/js-yaml/issues/730#issuecomment-3549635876
    Issue Tracking
  • github.com https://github.com/nodeca/js-yaml/security/advisories/GHSA-mh29-5h37-fv8m
    Vendor Advisory

Remediation

  • github.com https://github.com/nodeca/js-yaml/commit/383665ff4248ec2192d1274e934462bb30426879
    Patch
  • github.com https://github.com/nodeca/js-yaml/commit/5278870a17454fe8621dbd8c445c412529525266
    Patch