{"id":"CVE-2026-59869","revision":"1ab4d4671d2f4807a6bce5479915fc1d","records":[{"revision":"1ab4d4671d2f4807a6bce5479915fc1d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-59869","aliases":[],"title":"js-yaml: YAML merge-key chains can force quadratic CPU consumption","description":"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.","state":0,"publishedAt":"2026-07-08T15:15:54.675+00:00","modifiedAt":"2026-07-09T15:14:29.753+00:00","affected":[{"ecosystem":"Vendor product","name":"js-yaml","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"nodeca\",\n                    \"product\": \"js-yaml\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 3.0.0, < 3.15.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 4.0.0, < 4.3.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/nodeca/js-yaml/security/advisories/GHSA-52cp-r559-cp3m","https://github.com/nodeca/js-yaml/commit/24f13e79ee1343a7e30bd6f6c9d9cdbf0ac9b2b7","https://github.com/nodeca/js-yaml/commit/59423c6f8cdc78742ac00e25a4dd39ef16b702e4","https://github.com/nodeca/js-yaml/releases/tag/3.15.0","https://github.com/nodeca/js-yaml/releases/tag/4.3.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-59869","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-59869","identifiers":["CVE-2026-59869"]},"retained":false,"historicalAffected":[]}],"coverage":[]}