CVE-2025-54364

Name	CVE-2025-54364
Description	Microsoft Knack 0.12.0 allows Regular expression Denial of Service (ReDoS) in the knack.introspection module. option_descriptions employs an inefficient regular expression pattern: "\s(:param)\s+(.+?)\s:(.*)" that is susceptible to catastrophic backtracking when processing crafted docstrings containing a large volume of whitespace without a terminating colon. An attacker who can control or inject docstring content into affected applications can trigger excessive CPU consumption. This software is used by Azure CLI.
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	1111774

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
knack (PTS)	bullseye	0.8.0~rc2-1	vulnerable
	bookworm	0.10.1-1	vulnerable
	trixie	0.12.0-2	vulnerable
	forky, sid	0.13.0-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
knack	source	(unstable)	(unfixed)	unimportant		1111774

https://github.com/microsoft/knack/issues/281
Negligible security impact; disputed as security issue upstream in context
of its use by Azure CLI