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.
References
Configurations
History
30 Jun 2026, 03:16
| Type | Values Removed | Values Added |
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| References |
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| CWE | CWE-617 |
13 Mar 2026, 01:25
| Type | Values Removed | Values Added |
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| First Time |
Python-markdown markdown
Python-markdown |
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| CPE | cpe:2.3:a:python-markdown:markdown:3.8:*:*:*:*:python:*:* | |
| References | () https://github.com/Python-Markdown/markdown - Product | |
| References | () https://github.com/Python-Markdown/markdown/actions/runs/15736122892 - Product | |
| References | () https://github.com/Python-Markdown/markdown/issues/1534 - Exploit, Issue Tracking | |
| References | () http://www.openwall.com/lists/oss-security/2026/03/06/4 - Mailing List, Third Party Advisory |
12 Mar 2026, 17:16
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| Summary |
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| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.5 |
| CWE | CWE-400 |
06 Mar 2026, 21:16
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| References |
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05 Mar 2026, 15:16
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| New CVE |
Information
Published : 2026-03-05 15:16
Updated : 2026-07-15 02:17
NVD link : CVE-2025-69534
Mitre link : CVE-2025-69534
CVE.ORG link : CVE-2025-69534
JSON object : View
Products Affected
python-markdown
- markdown
