EUVD-2026-17879CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
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4Description
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. This vulnerability affects Corosync when running in totemudp/totemudpu mode, which is the default configuration.
Analysis
Out-of-bounds read in Corosync allows unauthenticated remote attackers to crash cluster nodes and potentially leak memory via malformed UDP packets. Affects default totemudp/totemudpu configurations across Red Hat Enterprise Linux 7/8/9/10 and OpenShift Container Platform 4. …
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Remediation
Within 24 hours: Inventory all Corosync deployments across RHEL 7/8/9/10 and OpenShift 4 environments and confirm totemudp/totemudpu protocol usage. Within 7 days: Implement network segmentation to restrict UDP cluster communication to trusted internal networks only; disable external access to Corosync ports (5404-5405 default) from untrusted sources. …
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