{"id":"CVE-2025-69534","details":"Python-Markdown version 3.8 contain a vulnerability where malformed HTML-like sequences can cause html.parser.HTMLParser to raise an unhandled AssertionError during Markdown parsing. Because Python-Markdown does not catch this exception, any application that processes attacker-controlled Markdown may crash. This enables remote, unauthenticated Denial of Service in web applications, documentation systems, CI/CD pipelines, and any service that renders untrusted Markdown. The issue was acknowledged by the vendor and fixed in version 3.8.1. This issue causes a remote Denial of Service in any application parsing untrusted Markdown, and can lead to Information Disclosure through uncaught exceptions.","aliases":["GHSA-5wmx-573v-2qwq"],"modified":"2026-03-23T05:11:43.419486Z","published":"2026-03-05T15:16:11.243Z","related":["CGA-c39v-92c2-3xwh","SUSE-SU-2026:0846-1"],"references":[{"type":"WEB","url":"https://github.com/Python-Markdown/markdown/actions/runs/15736122892"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2026/03/06/4"},{"type":"REPORT","url":"https://github.com/Python-Markdown/markdown/issues/1534"},{"type":"PACKAGE","url":"https://github.com/Python-Markdown/markdown"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/Python-Markdown/markdown","events":[{"introduced":"0"},{"last_affected":"b34e1d03387be771aa626241fe56f8f0c34243f2"}],"database_specific":{"versions":[{"introduced":"0"},{"last_affected":"3.8"}]}}],"versions":["1.7_Final","2.0-Final","2.0-alpha","2.0-beta","2.0-rc1","2.0.1","2.0.3","2.1.0.alpha","2.1.0.beta","2.1.0.final","2.1.1.final","2.2.0.alpha","2.2.0.final","2.2.1.final","2.3.1.final","2.3.final","2.4-final","2.4.1-final","2.5-final","2.5.1-final","2.5.2-final","2.6-final","2.6.1-final","2.6.10","2.6.11","2.6.2-final","2.6.3-final","2.6.4-final","2.6.5-final","2.6.6-final","2.6.7-final","2.6.8-final","2.6.9","3.0","3.0.1","3.1","3.1.1","3.2","3.2.1","3.2.2","3.3","3.3.1","3.3.2","3.3.3","3.3.4","3.3.5","3.3.6","3.3.7","3.4","3.4.1","3.4.2","3.4.3","3.4.4","3.5","3.5.1","3.5.2","3.6","3.7","3.8"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-69534.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}