CVE-2026-35091: Corosync

High severity, CVSS 8.2. EPSS: 1.1% chance of exploitation in the next 30 days.

A flaw was found in Corosync. A remote unauthenticated attacker can exploit a wrong return value vulnerability in the Corosync membership commit token sanity check by sending a specially crafted User Datagram Protocol (UDP) packet. This can lead to an out-of-bounds read, causing a denial of service (DoS) and potentially disclosing limited memory contents

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.