| 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) |
| Debian Bugs | 1151085 |
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.
Notes
[trixie] - python-markdown2 <no-dsa> (Minor issue)
[bookworm] - python-markdown2 <postponed> (Minor issue)
https://gist.github.com/NanaSec/354b4188bbd7f4105008c7b8be49b0ba