CVE-2026-88753

Name	CVE-2026-88753
Description	A Regular-Expression Denial of Service (ReDoS) in the Markdown2. extract_metadata() function (lib/markdown2.py) of trentm markdown2 through v2.5.5 allows attackers to cause a Denial of Service (DoS) via a crafted Markdown document.
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
python-markdown2 (PTS)	bookworm	2.4.1-1	vulnerable
	trixie	2.4.11-1	vulnerable
	forky, sid	2.5.4-4	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
python-markdown2	source	(unstable)	(unfixed)

https://gist.github.com/NanaSec/354b4188bbd7f4105008c7b8be49b0ba