{"id":"GHSA-rrrm-qjm4-v8hf","summary":"Inefficient Regular Expression Complexity in marked","details":"### Impact\n\n_What kind of vulnerability is it?_\n\nDenial of service.\n\nThe regular expression `block.def` may cause catastrophic backtracking against some strings.\nPoC is the following.\n\n```javascript\nimport * as marked from \"marked\";\n\nmarked.parse(`[x]:${' '.repeat(1500)}x ${' '.repeat(1500)} x`);\n```\n\n_Who is impacted?_\n\nAnyone who runs untrusted markdown through marked and does not use a worker with a time limit.\n\n### Patches\n\n_Has the problem been patched?_\n\nYes\n\n_What versions should users upgrade to?_\n\n4.0.10\n\n### Workarounds\n\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\nDo not run untrusted markdown through marked or run marked on a [worker](https://marked.js.org/using_advanced#workers) thread and set a reasonable time limit to prevent draining resources.\n\n### References\n\n_Are there any links users can visit to find out more?_\n\n- https://marked.js.org/using_advanced#workers\n- https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\n* Open an issue in [marked](https://github.com/markedjs/marked)\n","aliases":["CVE-2022-21680"],"modified":"2026-09-10T03:49:11.241428213Z","published":"2022-01-14T21:04:41Z","database_specific":{"cwe_ids":["CWE-1333","CWE-400"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2022-01-14T19:56:20Z","nvd_published_at":"2022-01-14T17:15:00Z"},"references":[{"type":"WEB","url":"https://github.com/markedjs/marked/security/advisories/GHSA-rrrm-qjm4-v8hf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-21680"},{"type":"WEB","url":"https://github.com/markedjs/marked/commit/c4a3ccd344b6929afa8a1d50ac54a721e57012c0"},{"type":"PACKAGE","url":"https://github.com/markedjs/marked"},{"type":"WEB","url":"https://github.com/markedjs/marked/releases/tag/v4.0.10"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AIXDMC3CSHYW3YWVSQOXAWLUYQHAO5UX"}],"affected":[{"package":{"name":"marked","ecosystem":"npm","purl":"pkg:npm/marked"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.0.10"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/01/GHSA-rrrm-qjm4-v8hf/GHSA-rrrm-qjm4-v8hf.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:H"}]}