{"id":"CVE-2026-59868","summary":"js-yaml: YAML merge-key chains can force quadratic CPU consumption","details":"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.","aliases":["GHSA-g796-fgmg-93mv"],"modified":"2026-08-12T03:51:08.347940150Z","published":"2026-07-08T15:18:19.422Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-407"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59868.json"},"references":[{"type":"WEB","url":"https://github.com/nodeca/js-yaml/releases/tag/5.2.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59868.json"},{"type":"ADVISORY","url":"https://github.com/nodeca/js-yaml/security/advisories/GHSA-g796-fgmg-93mv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59868"},{"type":"FIX","url":"https://github.com/nodeca/js-yaml/commit/3105455b81dee69e0fd36e09ac0b2ccfdb54adc1"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/nodeca/js-yaml","events":[{"introduced":"75148bc4f5eb69b3d338e1c355d8bb2dba5bdf34"},{"fixed":"c28ed5ec1aa66a37b8202e17d0caa122922a1b00"},{"fixed":"3105455b81dee69e0fd36e09ac0b2ccfdb54adc1"}],"database_specific":{"cpe":"cpe:2.3:a:nodeca:js-yaml:*:*:*:*:*:node.js:*:*","extracted_events":[{"introduced":"5.0.0"},{"fixed":"5.2.0"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["5.1.0","5.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59868.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}