{"id":"AZL-99888","summary":"CVE-2026-81665 affecting package corosync 3.0.4-4","details":"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.","modified":"2026-09-12T05:28:09Z","published":"2026-09-04T09:17:11Z","upstream":["CVE-2026-81665"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81665"}],"affected":[{"package":{"name":"corosync","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/corosync"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.0.4-4"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-99888.json"}}],"schema_version":"1.9.0"}