Hi,

The following vulnerability was published for python-markdown2.

CVE-2026-88753[0]:
| 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.

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


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-88753
https://www.cve.org/CVERecord?id=CVE-2026-88753

Please adjust the affected versions in the BTS as needed.