{"id":"CVE-2022-34749","aliases":["GHSA-fw3v-x4f2-v673","PYSEC-2022-237"],"url":"https://o3.security/vulnerability/CVE-2022-34749","summary":"Mistune vulnerable to catastrophic backtracking","details":"In mistune through 2.0.2, support of inline markup is implemented by using regular expressions that can involve a high amount of backtracking on certain edge cases. This behavior is commonly named catastrophic backtracking.","published":"2022-07-25T00:00:00Z","modified":"2026-08-07T11:49:17.980977209Z","cvss":{"score":8.6,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"mistune","fixedVersion":"2.0.3"}],"fix":{"url":"https://github.com/lepture/mistune/commit/a6d43215132fe4f3d93f8d7e90ba83b16a0838b2","label":"lepture/mistune@a6d4321"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/34xxx/CVE-2022-34749.json"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TQHXITQ2DSBYOILKHXBSBB7PFBPZHF63/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-34749"},{"type":"FIX","url":"https://github.com/lepture/mistune/commit/a6d43215132fe4f3d93f8d7e90ba83b16a0838b2"},{"type":"PACKAGE","url":"https://github.com/lepture/mistune/releases"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:49:17.980977209Z"}}