{"id":"PYSEC-2026-1604","summary":"markdownify allows large headline prefixes such as \u003ch9999999\u003e, which causes memory consumption","details":"python-markdownify (aka markdownify) before 0.14.1 allows large headline prefixes such as \u003ch9999999\u003e in addition to \u003ch1\u003e through \u003ch6\u003e. This causes memory consumption.","aliases":["CVE-2025-46656","GHSA-7mpr-5m44-h73r"],"modified":"2026-07-07T17:46:15.322572753Z","published":"2026-07-07T16:02:51.414781Z","references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-46656"},{"type":"WEB","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"},{"type":"WEB","url":"https://github.com/matthewwithanm/python-markdownify/compare/0.14.0...0.14.1"},{"type":"PACKAGE","url":"https://pypi.org/project/markdownify"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-7mpr-5m44-h73r"}],"affected":[{"package":{"name":"markdownify","ecosystem":"PyPI","purl":"pkg:pypi/markdownify"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.14.1"}]}],"versions":["0.10.0","0.10.1","0.10.2","0.10.3","0.11.0","0.11.1","0.11.2","0.11.4","0.11.5","0.11.6","0.12.1","0.13.0","0.13.1","0.14.0","0.2.0","0.3.0","0.4.0","0.4.1","0.5.1","0.5.2","0.5.3","0.6.0","0.6.1","0.6.3","0.6.4","0.6.5","0.6.6","0.7.0","0.7.1","0.7.2","0.7.3","0.7.4","0.8.0","0.8.1","0.9.0","0.9.2","0.9.3","0.9.4"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/markdownify/PYSEC-2026-1604.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}