{"id":"CVE-2025-46656","aliases":["EUVD-2025-12476","GHSA-7mpr-5m44-h73r","PYSEC-2026-1604"],"status":"published","title":"markdownify allows large headline prefixes such as \u003ch9999999\u003e, which causes memory consumption","description":"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.","severity":{"version":"3.1","score":2.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.0022,"percentile":0.12645,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1284"],"published":"2025-04-26T00:00:00Z","modified":"2026-10-28T02:30:49Z","fixes":[{"ecosystem":"PyPI","package":"markdownify","fixed_in":["0.14.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"markdownify","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.14.1"}]}]},{"source":"osv","ecosystem":"PyPI","package":"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"]},{"source":"osv","ecosystem":"PyPI","package":"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"]}],"products":[{"vendor":"matthewwithanm","product":"markdownify"},{"vendor":"python-markdownify","product":"python-markdownify"}],"references":[{"url":"https://github.com/matthewwithanm/python-markdownify/compare/0.14.0...0.14.1","tags":["Patch","web"]},{"url":"https://github.com/matthewwithanm/python-markdownify/issues/143","tags":["exploit","Exploit","report","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-46656","tags":["advisory"]},{"url":"https://github.com/matthewwithanm/python-markdownify/commit/959561879693bf4a576f99c6733b50b01186aa08","tags":["web"]},{"url":"https://github.com/advisories/GHSA-7mpr-5m44-h73r","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/46xxx/CVE-2025-46656.json","tags":["advisory"]},{"url":"https://github.com/matthewwithanm/python-markdownify","tags":["package"]},{"url":"https://pypi.org/project/markdownify","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2025-46656","description":"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.","status":"published","published":"2025-04-26T00:00:00Z","modified":"2025-04-29T15:22:30.63Z","cvss":[{"version":"3.1","score":2.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"cna"}],"cwes":["CWE-1284"],"updated_at":"2026-11-02T14:32:36.706507Z"}],"euvd":[{"id":"EUVD-2025-12476","description":"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.","status":"published","published":"2025-04-26T00:00:00Z","modified":"2025-04-29T15:22:30Z","cvss":[{"version":"3.1","score":2.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T20:52:00.449871Z"}],"ghsa":[{"id":"GHSA-7mpr-5m44-h73r","title":"markdownify allows large headline prefixes such as \u003ch9999999\u003e, which causes memory consumption","description":"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.","status":"published","published":"2025-04-27T00:30:34Z","modified":"2025-04-28T14:34:52Z","cvss":[{"version":"3.1","score":2.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"cwes":["CWE-1284"],"updated_at":"2026-11-02T14:38:41.402125Z"}],"nvd":[{"id":"CVE-2025-46656","description":"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.","status":"published","published":"2025-04-26T22:15:17.26Z","modified":"2026-06-17T09:26:47.117Z","cvss":[{"version":"3.1","score":2.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"secondary"},{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"primary"}],"cwes":["CWE-1284"],"updated_at":"2026-11-02T14:11:02.570368Z"}],"osv":[{"id":"CVE-2025-46656","description":"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.","status":"published","published":"2025-04-26T00:00:00Z","modified":"2026-10-28T02:30:49.111233379Z","cvss":[{"version":"3.1","score":2.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"cwes":["CWE-1284"],"updated_at":"2026-11-02T15:44:49.707645Z"},{"id":"GHSA-7mpr-5m44-h73r","title":"markdownify allows large headline prefixes such as \u003ch9999999\u003e, which causes memory consumption","description":"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.","status":"published","published":"2025-04-27T00:30:34Z","modified":"2026-07-07T17:56:59.96266392Z","cvss":[{"version":"3.1","score":2.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"cwes":["CWE-1284"],"updated_at":"2026-11-02T15:46:41.349637Z"},{"id":"PYSEC-2026-1604","title":"markdownify allows large headline prefixes such as \u003ch9999999\u003e, which causes memory consumption","description":"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.","status":"published","published":"2026-07-07T16:02:51.414781Z","modified":"2026-07-07T17:46:15.322572753Z","cvss":[{"version":"3.1","score":2.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T15:52:55.06457Z"}]}}