CVE-2026-35092

NameCVE-2026-35092
DescriptionA 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.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDSA-6261-1
Debian Bugs1133837

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
corosync (PTS)bullseye3.1.2-2vulnerable
bullseye (security)3.1.2-2+deb11u1vulnerable
bookworm3.1.7-1+deb12u1vulnerable
bookworm (security)3.1.7-1+deb12u2fixed
trixie3.1.9-2vulnerable
trixie (security)3.1.9-2+deb13u1fixed
forky3.1.10-1vulnerable
sid3.1.10-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
corosyncsourcebookworm3.1.7-1+deb12u2DSA-6261-1
corosyncsourcetrixie3.1.9-2+deb13u1DSA-6261-1
corosyncsource(unstable)3.1.10-21133837

Notes

https://bugzilla.redhat.com/show_bug.cgi?id=2453814
https://bugzilla.redhat.com/show_bug.cgi?id=2453169
https://github.com/corosync/corosync/commit/4082294f5094a7591e4e00658c5a605f05d644f1
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