{"id":"CVE-2025-64718","title":"js-yaml is a JavaScript YAML parser and dumper","summary":"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 …","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","cwe":["CWE-1321"],"vendor":"nodeca","product":"js-yaml","affected":["js-yaml < 3.14.2","js-yaml >= 4.0.0, < 4.1.1"],"patched":["js-yaml 4.1.1"],"published":"2025-11-13","updated":"2026-10-07","sourceUpdated":"2026-10-07T21:10:00.200","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-64718","references":[{"url":"https://github.com/nodeca/js-yaml/commit/383665ff4248ec2192d1274e934462bb30426879","label":"security-advisories@github.com"},{"url":"https://github.com/nodeca/js-yaml/commit/5278870a17454fe8621dbd8c445c412529525266","label":"security-advisories@github.com"},{"url":"https://github.com/nodeca/js-yaml/issues/730#issuecomment-3549635876","label":"security-advisories@github.com"},{"url":"https://github.com/nodeca/js-yaml/security/advisories/GHSA-mh29-5h37-fv8m","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-mh29-5h37-fv8m","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00408,"epssPercentile":0.32928,"ingestedAt":"2026-10-07T21:54:15.033Z","slug":"CVE-2025-64718","body":"## Overview\n\njs-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).\n\n## Affected\n\n- `js-yaml < 3.14.2`\n- `js-yaml >= 4.0.0, < 4.1.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `js-yaml 4.1.1`","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}