CVE-2025-69534 — n/a / n/a

Description (CNA)

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 (CNA)

Vendor / product	Versions
n/a / n/a	affected n/a

CWE

No CWE identifiers supplied.

References

ADP enrichment

CVE

No English description supplied.

http://www.openwall.com/lists/oss-security/2026/03/06/4

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

A flaw was found in Python-Markdown. Parsing crafted markdown content containing malformed HTML-like sequences causes html.parser.HTMLParser to raise an unhandled AssertionError. This unhandled exception allows an attacker to cause an application crash and potentially disclose sensitive information via its stack trace.