CVE-2026-59924

Name	CVE-2026-59924
Description	Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Include.parse() joins and normalizes user-supplied include paths without verifying that the result remains within the intended markdown directory, allowing crafted include paths to access files outside that directory when markdown files are processed using md.read(). This issue is fixed in version 3.3.0.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
mistune (PTS)	bullseye	0.8.4-4	vulnerable
	bookworm	2.0.4-1	vulnerable
	trixie	3.1.3-1	vulnerable
	forky, sid	3.1.4-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
mistune	source	(unstable)	(unfixed)

Notes

https://github.com/lepture/mistune/security/advisories/GHSA-r4rv-85jg-w4mf
https://github.com/lepture/mistune/security/advisories/GHSA-r4rv-85jg-w4mf
Fixed by: https://github.com/lepture/mistune/commit/1bef343ade163fc3bb95572b15be720084cdb993 (v3.3.0)