{"id":"CVE-2022-21681","aliases":["GHSA-5v2h-r2cx-5xgj"],"url":"https://o3.security/vulnerability/CVE-2022-21681","summary":"Exponential catastrophic backtracking (ReDoS) in marked","details":"Marked is a markdown parser and compiler. Prior to version 4.0.10, the regular expression `inline.reflinkSearch` may cause catastrophic backtracking against some strings and lead to a denial of service (DoS). Anyone who runs untrusted markdown through a vulnerable version of marked and does not use a worker with a time limit may be affected. This issue is patched in version 4.0.10. As a workaround, avoid running untrusted markdown through marked or run marked on a worker thread and set a reasonable time limit to prevent draining resources.","published":"2022-01-14T00:00:00Z","modified":"2026-08-03T21:44:57.383976528Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"marked","fixedVersion":"4.0.10"}],"fix":{"url":"https://github.com/markedjs/marked/commit/8f806573a3f6c6b7a39b8cdb66ab5ebb8d55a5f5","label":"markedjs/marked@8f80657"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/21xxx/CVE-2022-21681.json"},{"type":"ADVISORY","url":"https://github.com/markedjs/marked/security/advisories/GHSA-5v2h-r2cx-5xgj"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AIXDMC3CSHYW3YWVSQOXAWLUYQHAO5UX/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-21681"},{"type":"FIX","url":"https://github.com/markedjs/marked/commit/8f806573a3f6c6b7a39b8cdb66ab5ebb8d55a5f5"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-03T21:44:57.383976528Z"}}