CVE-2026-2903

Name	CVE-2026-2903
Description	A flaw has been found in skvadrik re2c up to 4.4. Impacted is the function check_and_merge_special_rules of the file src/parse/ast.cc. This manipulation causes null pointer dereference. The attack can only be executed locally. The exploit has been published and may be used. Patch name: febeb977936f9519a25d9fbd10ff8256358cdb97. It is suggested to install a patch to address this issue.
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
re2c (PTS)	bullseye	2.0.3-1	vulnerable
	bookworm	3.0-2	vulnerable
	trixie	4.1-1	vulnerable
	forky, sid	4.4-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
re2c	source	(unstable)	(unfixed)

https://github.com/skvadrik/re2c/issues/571
Fixed by: https://github.com/skvadrik/re2c/commit/febeb977936f9519a25d9fbd10ff8256358cdb97