Description
PyMdown Extensions is a set of extensions for the `Python-Markdown` markdown project. Versions prior to 10.16.1 have a ReDOS bug found within the figure caption extension (`pymdownx.blocks.caption`). In systems that take unchecked user content, this could cause long hanges when processing the data if a malicious payload was crafted. This issue is patched in Release 10.16.1. As a workaround, those who process unknown user content without timeouts or other safeguards in place to prevent really large, malicious content being aimed at systems may avoid the use of `pymdownx.blocks.caption` until they're able to upgrade.
Problem types
CWE-1333: Inefficient Regular Expression Complexity
Product status
References
github.com/...nsions/security/advisories/GHSA-r6h4-mm7h-8pmq
github.com/...ommit/b50d15a56850ed1408a284bba81cc019c6bd72e8
pypi.org/project/pymdown-extensions/10.16.1
Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.
