{"id":"CVE-2026-81666","aliases":["DEBIAN-CVE-2026-81666","EUVD-2026-70987","GHSA-8297-6g53-8gp5","SUSE-SU-2026:23850-1","SUSE-SU-2026:4202-1","UBUNTU-CVE-2026-81666","openSUSE-SU-2026:11715-1","openSUSE-SU-2026:21887-1"],"status":"published","title":"Corosync: corosync: integer overflow in check_memb_commit_token_sanity may bypass message length validation on 32-bit systems","description":"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.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00246,"percentile":0.1602,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-190"],"published":"2026-09-04T09:46:06Z","modified":"2026-11-06T01:17:54Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.10-1","3.1.10-2","3.1.10-3","3.1.10-4","3.1.10-5","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"]},{"source":"osv","ecosystem":"Debian:13","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.10-1","3.1.10-2","3.1.10-3","3.1.10-4","3.1.10-5","3.1.9-2","3.1.9-2+deb13u1"]},{"source":"osv","ecosystem":"Debian:14","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.10-1","3.1.10-2","3.1.10-3","3.1.10-4","3.1.10-5","3.1.9-2"]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise High Availability Extension 16.0","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.9-160000.4.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise High Availability Extension 15 SP4","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.6-150300.12.19.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise High Availability Extension 15 SP5","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.6-150300.12.19.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise High Availability Extension 15 SP6","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.6-150300.12.19.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise High Availability Extension 15 SP7","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.6-150300.12.19.1"}]}],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.4-0ubuntu1","2.3.5-3","2.3.5-3ubuntu1","2.3.5-3ubuntu2","2.3.5-3ubuntu2.1","2.3.5-3ubuntu2.3"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.2-3build1","2.4.2-3ubuntu1","2.4.3-0ubuntu1","2.4.3-0ubuntu1.1","2.4.3-0ubuntu1.2","2.4.3-0ubuntu1.3"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.1-2ubuntu1","3.0.2-1ubuntu1","3.0.2-1ubuntu2","3.0.3-2ubuntu1","3.0.3-2ubuntu2","3.0.3-2ubuntu2.1","3.0.3-2ubuntu2.2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.2-2ubuntu1","3.1.6-1ubuntu1","3.1.6-1ubuntu1.1","3.1.6-1ubuntu1.2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.7-1ubuntu1","3.1.7-1ubuntu2","3.1.7-1ubuntu3","3.1.7-1ubuntu3.1","3.1.7-1ubuntu3.2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.9-2ubuntu3","3.1.10-2ubuntu2","3.1.10-3ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.9-2ubuntu1","3.1.9-2ubuntu2","3.1.9-2ubuntu3"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.10-5.1"}]}],"bundled":2},{"source":"osv","ecosystem":"openSUSE:Leap 16.0","package":"corosync","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.9-160000.4.1"}]}],"bundled":2}],"products":[{"vendor":"red hat","product":"red hat enterprise linux 10"},{"vendor":"red hat","product":"red hat enterprise linux 7"},{"vendor":"red hat","product":"red hat enterprise linux 8"},{"vendor":"red hat","product":"red hat enterprise linux 9"},{"vendor":"red hat","product":"red hat openshift container platform 4"},{"vendor":"red hat","product":"red hat openshift container platform 5"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-81666","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2524923","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81666"},{"url":"https://github.com/advisories/GHSA-8297-6g53-8gp5"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-81666","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202623850-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1278738","tags":["report"]},{"url":"https://bugzilla.suse.com/1278739","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-81665","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-81666","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20264202-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-81666","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-81666","tags":["report"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-81666","title":"Corosync: corosync: integer overflow in check_memb_commit_token_sanity may bypass message length validation on 32-bit systems","description":"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.","status":"published","published":"2026-09-04T09:46:06.13Z","modified":"2026-11-06T01:04:10.451Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-190"],"updated_at":"2026-11-06T02:55:55.947181Z"}],"euvd":[{"id":"EUVD-2026-70987","description":"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.","status":"published","published":"2026-09-04T09:46:06Z","modified":"2026-11-06T01:04:10Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-06T02:02:53.341523Z"}],"ghsa":[{"id":"GHSA-8297-6g53-8gp5","title":"An integer overflow was found in Corosync's handling of membership commit token messages. The...","description":"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.","status":"published","published":"2026-09-04T12:30:55Z","modified":"2026-09-04T12:31:01Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T15:11:21.957806Z"}],"nvd":[{"id":"CVE-2026-81666","description":"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.","status":"published","published":"2026-09-04T10:17:13.187Z","modified":"2026-11-06T01:17:54.057Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-190"],"updated_at":"2026-11-06T06:59:05.303911Z"}],"osv":[{"id":"DEBIAN-CVE-2026-81666","description":"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.","status":"published","published":"2026-09-04T10:17:13.187Z","modified":"2026-11-04T09:47:29.572656244Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-04T10:05:57.467041Z"},{"id":"UBUNTU-CVE-2026-81666","description":"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.","status":"published","published":"2026-09-04T10:17:00Z","modified":"2026-10-17T13:01:11.37063658Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T16:57:22.213888Z"},{"id":"openSUSE-SU-2026:11715-1","title":"corosync-3.1.10-5.1 on GA media","description":"These are all security issues fixed in the corosync-3.1.10-5.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-09-08T00:00:00Z","modified":"2026-09-09T10:00:04.982277084Z","updated_at":"2026-11-02T16:58:39.516824Z"},{"id":"openSUSE-SU-2026:21887-1","title":"Security update for corosync","description":"This update for corosync fixes the following issues:\n\n- CVE-2026-81665: heap-based buffer overflow in totempg assembly buffer during fragmented message reassembly\n  (bsc#1278738).\n- CVE-2026-81666: integer overflow in check_memb_commit_token_sanity may bypass message length validation on 32-bit\n  systems (bsc#1278739).\n","status":"published","published":"2026-09-20T04:53:02Z","modified":"2026-09-25T18:23:11.430583776Z","updated_at":"2026-11-02T16:58:42.426393Z"},{"id":"SUSE-SU-2026:23850-1","title":"Security update for corosync","description":"This update for corosync fixes the following issues:\n\n- CVE-2026-81665: heap-based buffer overflow in totempg assembly buffer during fragmented message reassembly\n  (bsc#1278738).\n- CVE-2026-81666: integer overflow in check_memb_commit_token_sanity may bypass message length validation on 32-bit\n  systems (bsc#1278739).\n","status":"published","published":"2026-09-20T04:53:53Z","modified":"2026-09-27T18:23:15.792571294Z","updated_at":"2026-11-02T15:54:03.991985Z"},{"id":"SUSE-SU-2026:4202-1","title":"Security update for corosync","description":"This update for corosync fixes the following issues:\n\n- CVE-2026-81665: heap-based buffer overflow in totempg assembly buffer during fragmented message reassembly\n  (bsc#1278738).\n- CVE-2026-81666: integer overflow in check_memb_commit_token_sanity may bypass message length validation on 32-bit\n  systems (bsc#1278739).\n","status":"published","published":"2026-09-16T08:18:19Z","modified":"2026-09-16T21:45:03.596530847Z","updated_at":"2026-11-02T15:54:05.392906Z"}]}}