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CVE-2025-69534

python-markdown: denial of service via malformed HTML-like sequences

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.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Python-markdown
Products
Markdown
CVE-2019-25781

Python-Markdown 3.0 through 3.11.2 Denial of Service via Link Bracket Parsing

Python-Markdown 3.0 through 3.11.2 contains an algorithmic complexity vulnerability in inline link parsing that allows remote attackers to exhaust CPU through unmatched brackets. Attackers can submit short Markdown containing repeated [ or ![ characters, forcing LinkInlineProcessor.getText() and getLink() into quadratic scans that keep workers busy for minutes.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Python-markdown Python-markdown2 Project
Products
Markdown Python-markdown2