HIGH 7.5 NVD
CVE-2026-81665
A heap-based buffer overflow was found in Corosync's Totem Process Group (totempg) message reassembly. When processing fragmented multicast messages, the buffer
A heap-based buffer overflow was found in Corosync's Totem Process Group (totempg) message reassembly. When processing fragmented multicast messages, the buffer used to reassemble fragments lacks a runtime bounds check in release builds. A network-adjacent attacker able to send crafted multicast protocol messages to the cluster could cause a heap buffer overflow with attacker-controlled data. This can crash the Corosync daemon, causing a denial of service to the entire cluster, and may potentially allow further exploitation given sufficient heap-corruption control.
References
- https://access.redhat.com/security/cve/CVE-2026-81665
- https://bugzilla.redhat.com/show_bug.cgi?id=2524910
This high severity vulnerability with a CVSS score of 7.5 was published on 2026-09-04 via NVD.
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