CVE-2019-25781

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

Product

Microsoft Azl3 Python-markdown

PublishedOct 29, 2026

First seenNov 4, 2026

Weakness typeCWE-407CWE-407

How to fix

Sources list no fixed version or patch link for this vulnerability.

Affected products

Product	Affected versions	Fixed in
microsoft azl3_python-markdown_3.8.2-3	No range specified	—

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