{"id":"CVE-2025-64718","state":"PUBLISHED","title":"js-yaml has prototype pollution in merge (<<)","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).","publishedAt":"2025-11-13T15:32:44.634Z","updatedAt":"2026-01-29T22:08:30.431Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["nodeca js-yaml"],"affected":[{"vendor":"nodeca","product":"js-yaml","versions":[{"version":">= 4.0.0, < 4.1.1","status":"affected"},{"version":"< 3.14.2","status":"affected"}]}],"references":["https://github.com/nodeca/js-yaml/security/advisories/GHSA-mh29-5h37-fv8m","https://github.com/nodeca/js-yaml/issues/730#issuecomment-3549635876","https://github.com/nodeca/js-yaml/commit/383665ff4248ec2192d1274e934462bb30426879","https://github.com/nodeca/js-yaml/commit/5278870a17454fe8621dbd8c445c412529525266","https://github.com/advisories/GHSA-mh29-5h37-fv8m"],"weaknesses":["CWE-1321"],"ingestedAt":"2026-10-29T20:09:48.677Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/64xxx/CVE-2025-64718.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-64718","state":"PUBLISHED","datePublished":"2025-11-13T15:32:44.634Z","dateUpdated":"2026-01-29T22:08:30.431Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2025-11-10T14:07:42.922Z"},"containers":{"cna":{"title":"js-yaml has prototype pollution in merge (<<)","descriptions":[{"lang":"en","value":"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)."}],"affected":[{"vendor":"nodeca","product":"js-yaml","versions":[{"version":">= 4.0.0, < 4.1.1","status":"affected"},{"version":"< 3.14.2","status":"affected"}]}],"references":[{"url":"https://github.com/nodeca/js-yaml/security/advisories/GHSA-mh29-5h37-fv8m","name":"https://github.com/nodeca/js-yaml/security/advisories/GHSA-mh29-5h37-fv8m","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/nodeca/js-yaml/issues/730#issuecomment-3549635876","name":"https://github.com/nodeca/js-yaml/issues/730#issuecomment-3549635876","tags":["x_refsource_MISC"]},{"url":"https://github.com/nodeca/js-yaml/commit/383665ff4248ec2192d1274e934462bb30426879","name":"https://github.com/nodeca/js-yaml/commit/383665ff4248ec2192d1274e934462bb30426879","tags":["x_refsource_MISC"]},{"url":"https://github.com/nodeca/js-yaml/commit/5278870a17454fe8621dbd8c445c412529525266","name":"https://github.com/nodeca/js-yaml/commit/5278870a17454fe8621dbd8c445c412529525266","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1321","lang":"en","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-01-29T22:08:30.431Z"},"source":{"advisory":"GHSA-mh29-5h37-fv8m","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-11-13T16:18:01.997938Z","id":"CVE-2025-64718","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-11-13T16:18:39.270Z"}},{"title":"CVE Program Container","references":[{"url":"https://github.com/advisories/GHSA-mh29-5h37-fv8m"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-01-21T14:38:16.644Z"},"x_generator":{"engine":"ADPogram 0.0.1"}}]}}}