{"schema_version":"1.7.5","id":"GHSA-5wmx-573v-2qwq","published":"2026-03-05T15:30:36Z","modified":"2026-06-06T01:00:08.118291277Z","aliases":["CVE-2025-69534","PYSEC-2026-89"],"related":["CGA-c39v-92c2-3xwh"],"summary":"Python-Markdown has an Uncaught Exception","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.","affected":[{"package":{"name":"markdown","ecosystem":"PyPI","purl":"pkg:pypi/markdown"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.8.1"}]}],"versions":["1.7","2.0","2.0.1","2.0.2","2.0.3","2.1.0","2.1.1","2.2.0","2.2.1","2.3","2.3.1","2.4","2.4.1","2.5","2.5.1","2.5.2","2.6","2.6.1","2.6.10","2.6.11","2.6.2","2.6.3","2.6.4","2.6.5","2.6.6","2.6.7","2.6.8","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://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-5wmx-573v-2qwq/GHSA-5wmx-573v-2qwq.json"}}],"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-69534"},{"type":"WEB","url":"https://github.com/Python-Markdown/markdown/issues/1534"},{"type":"WEB","url":"https://github.com/Python-Markdown/markdown/pull/1535"},{"type":"WEB","url":"https://github.com/Python-Markdown/markdown"},{"type":"WEB","url":"https://github.com/Python-Markdown/markdown/actions/runs/15736122892"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/markdown/PYSEC-2026-89.yaml"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/03/06/4"}],"database_specific":{"cwe_ids":["CWE-248","CWE-400"],"github_reviewed":true,"github_reviewed_at":"2026-03-05T21:59:47Z","nvd_published_at":"2026-03-05T15:16:11Z","severity":"MODERATE"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"}]}