{"id":"CVE-2025-46656","aliases":["GHSA-7mpr-5m44-h73r","PYSEC-2026-1604"],"title":"markdownify allows large headline prefixes such as <h9999999>, which causes memory consumption","summary":"markdownify allows large headline prefixes such as <h9999999>, which causes memory consumption","severity":"low","cvss":2.9,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","vendor":"markdownify","product":"markdownify","ecosystem":"pip","affected":["markdownify < 0.14.1"],"patched":["markdownify 0.14.1"],"published":"2025-04-27","updated":"2026-07-07","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-7mpr-5m44-h73r","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-46656"},{"url":"https://github.com/matthewwithanm/python-markdownify/issues/143"},{"url":"https://github.com/matthewwithanm/python-markdownify/commit/959561879693bf4a576f99c6733b50b01186aa08"},{"url":"https://github.com/matthewwithanm/python-markdownify"},{"url":"https://github.com/matthewwithanm/python-markdownify/compare/0.14.0...0.14.1"}],"tags":["osv","pip"],"epss":0.0022,"epssPercentile":0.12756,"ingestedAt":"2026-07-08T18:25:47.046Z","slug":"CVE-2025-46656","body":"## Overview\n\npython-markdownify (aka markdownify) before 0.14.1 allows large headline prefixes such as <h9999999> in addition to <h1> through <h6>. This causes memory consumption.\n\n## Affected packages\n\n- `markdownify < 0.14.1`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `markdownify 0.14.1`","depth":"sunlit","depthScore":16,"depthScoreParts":{"impact":16,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}