{"id":"CVE-2025-46656","aliases":["GHSA-7mpr-5m44-h73r","PYSEC-2026-1604"],"url":"https://o3.security/vulnerability/CVE-2025-46656","summary":"markdownify allows large headline prefixes such as <h9999999>, which causes memory consumption","details":"python-markdownify (aka markdownify) before 0.14.1 allows large headline prefixes such as <h9999999> in addition to <h1> through <h6>. This causes memory consumption.","published":"2025-04-26T00:00:00Z","modified":"2026-08-12T03:51:12.217358869Z","cvss":{"score":2.9,"severity":"LOW","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":{"score":0.00206,"percentile":0.10509,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"markdownify","fixedVersion":"0.14.1"}],"fix":{"url":"https://github.com/matthewwithanm/python-markdownify/commit/959561879693bf4a576f99c6733b50b01186aa08","label":"matthewwithanm/python-markdownify@9595618"},"references":[{"type":"WEB","url":"https://github.com/matthewwithanm/python-markdownify/compare/0.14.0...0.14.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/46xxx/CVE-2025-46656.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-46656"},{"type":"REPORT","url":"https://github.com/matthewwithanm/python-markdownify/issues/143"},{"type":"WEB","url":"https://github.com/matthewwithanm/python-markdownify/commit/959561879693bf4a576f99c6733b50b01186aa08"},{"type":"PACKAGE","url":"https://github.com/matthewwithanm/python-markdownify"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:12.217358869Z"}}