Corosync: corosync: denial of service via integer overflow in join message validation

Summary

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.

Timeline

1. Apr 1, 2026, 1:18 PM UTCCVE published
2. Apr 1, 2026, 1:29 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Aug 21, 2026, 12:15 PM UTCRecord last updated

Affected versions

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

References 17