{"id":"CVE-2026-59869","sourceIdentifier":"security-advisories@github.com","published":"2026-07-08T16:16:33.423","lastModified":"2026-07-13T15:05:34.130","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in versions 3.15.0 and 4.3.0."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"nodeca","product":"js-yaml","versions":[{"version":">= 3.0.0, < 3.15.0","status":"affected"},{"version":">= 4.0.0, < 4.3.0","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-09T15:14:16.302841Z","id":"CVE-2026-59869","options":[{"exploitation":"poc"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-407"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:nodeca:js-yaml:*:*:*:*:*:node.js:*:*","versionStartIncluding":"3.0.0","versionEndExcluding":"3.15.0","matchCriteriaId":"F0303A0E-076A-425B-9746-6C685213D721"},{"vulnerable":true,"criteria":"cpe:2.3:a:nodeca:js-yaml:*:*:*:*:*:node.js:*:*","versionStartIncluding":"4.0.0","versionEndExcluding":"4.3.0","matchCriteriaId":"90F8FD99-9730-49E7-B8AC-97BBF4658327"}]}]}],"references":[{"url":"https://github.com/nodeca/js-yaml/commit/24f13e79ee1343a7e30bd6f6c9d9cdbf0ac9b2b7","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/nodeca/js-yaml/commit/59423c6f8cdc78742ac00e25a4dd39ef16b702e4","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/nodeca/js-yaml/releases/tag/3.15.0","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/nodeca/js-yaml/releases/tag/4.3.0","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m","source":"security-advisories@github.com","tags":["Exploit","Vendor Advisory"]},{"url":"https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["Exploit","Vendor Advisory"]}]}