{"id":"CVE-2026-59868","sourceIdentifier":"security-advisories@github.com","published":"2026-07-08T16:16:33.270","lastModified":"2026-07-13T15:06:34.173","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"js-yaml is a JavaScript YAML parser and dumper. From 5.0.0 before 5.2.0, when merge keys are enabled, 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 version 5.2.0."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"nodeca","product":"js-yaml","versions":[{"version":">= 5.0.0, < 5.2.0","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:L","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW"},"exploitabilityScore":3.9,"impactScore":1.4},{"source":"nvd@nist.gov","type":"Primary","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":"2026-07-09T13:41:56.104624Z","id":"CVE-2026-59868","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"}]},{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-770"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:nodeca:js-yaml:*:*:*:*:*:node.js:*:*","versionStartIncluding":"5.0.0","versionEndExcluding":"5.2.0","matchCriteriaId":"8C8E7342-F2B6-4FD8-9FC4-E003EDAA68BC"}]}]}],"references":[{"url":"https://github.com/nodeca/js-yaml/commit/3105455b81dee69e0fd36e09ac0b2ccfdb54adc1","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/nodeca/js-yaml/releases/tag/5.2.0","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/nodeca/js-yaml/security/advisories/GHSA-g796-fgmg-93mv","source":"security-advisories@github.com","tags":["Exploit","Vendor Advisory"]},{"url":"https://github.com/nodeca/js-yaml/security/advisories/GHSA-g796-fgmg-93mv","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["Exploit","Vendor Advisory"]}]}