CVE WatchJul 15, 2026

CVE-2025-69534

Python-Markdown version 3.8 contain a vulnerability where malformed HTML-like sequences can cause html.parser.HTMLParser to raise an unhandl

CVSS

7.5

High

EPSS

0.6%

p43

KEV

—

Exploit Today

0-100

Published: Mar 5, 2026 · Last modified: Jul 15, 2026 · CWE-400 · CWE-617

EPSS · 30d

0.6%EPSS · 30 days0.6%

2026-06-302026-07-16

Technical description

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.

Official references

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