Corosync: corosync: denial of service and information disclosure via crafted udp packet

Summary

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

Timeline

1. Apr 1, 2026, 1:18 PM UTCCVE published
2. Apr 1, 2026, 8:28 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

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• corosync

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• corosync

  Version range not reported

• corosync

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• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

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• corosync

  Version range not reported

• corosync

  Version range not reported

• corosync

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• corosync

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• corosync

  Version range not reported

• corosync

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• corosync

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• corosync

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• corosync

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

References 17