CVE-2026-35092: Corosync

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

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.

Affected products

• Corosync Corosync: affected versions not specified
• Red Hat Enterprise Linux: version 7.0 only; version 8.0 only; version 9.0 only; version 10.0 only
• Red Hat Openshift: version 4.0 only

Published 2026-04-01. Last modified 2026-08-21.