CVE-2026-35092

Name	CVE-2026-35092
Description	A flaw was found in Corosync. An integer overflow vulnerability in Corosync's join message sanity validation allows a remote, unauthenticated attacker to send crafted User Datagram Protocol (UDP) packets. This can cause the service to crash, leading to a denial of service. This vulnerability specifically affects Corosync deployments configured to use totemudp/totemudpu mode.
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
corosync (PTS)	bullseye	3.1.2-2	vulnerable
	bullseye (security)	3.1.2-2+deb11u1	vulnerable
	bookworm	3.1.7-1+deb12u1	vulnerable
	trixie	3.1.9-2	vulnerable
	forky, sid	3.1.10-1	vulnerable

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

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

https://bugzilla.redhat.com/show_bug.cgi?id=2453814
https://bugzilla.redhat.com/show_bug.cgi?id=2453169