{"id":"DEBIAN-CVE-2026-81666","details":"An integer overflow was found in Corosync's handling of membership commit token messages. The length-validation check for these messages can be bypassed on 32-bit systems due to an integer overflow in the calculation of the expected message length, allowing a crafted network packet to trigger an out-of-bounds memory access that crashes the Corosync daemon. This results in a denial of service for the affected cluster node. The overflow does not occur on 64-bit systems, where the length calculation is correctly performed in 64-bit arithmetic.","modified":"2026-09-09T08:47:24.449241693Z","published":"2026-09-04T10:17:13.187Z","upstream":["CVE-2026-81666"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-81666"}],"affected":[{"package":{"name":"corosync","ecosystem":"Debian:12","purl":"pkg:deb/debian/corosync?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.10-1","3.1.10-2","3.1.10-3","3.1.10-4","3.1.7-1","3.1.7-1+deb12u1","3.1.7-1+deb12u2","3.1.8-1","3.1.8-2","3.1.8-3","3.1.9-1","3.1.9-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-81666.json"}},{"package":{"name":"corosync","ecosystem":"Debian:13","purl":"pkg:deb/debian/corosync?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.10-1","3.1.10-2","3.1.10-3","3.1.10-4","3.1.9-2","3.1.9-2+deb13u1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-81666.json"}},{"package":{"name":"corosync","ecosystem":"Debian:14","purl":"pkg:deb/debian/corosync?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.10-1","3.1.10-2","3.1.10-3","3.1.10-4","3.1.9-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-81666.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}