{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-81665", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-81665", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-04T09:05:35.890Z", "updatedAt": "2026-10-21T20:43:33.349Z", "importedAt": "2026-10-24T01:58:30.346Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "Corosync: corosync: heap-based buffer overflow in totempg assembly buffer during fragmented message reassembly", "summary": "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.", "affected": [ { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected", "versions": [ { "version": "0:3.1.10-1.el10_2.2", "status": "unaffected", "versionType": "rpm", "lessThan": "*" } ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10.0 Extended Update Support", "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected", "versions": [ { "version": "0:3.1.9-1.el10_0.3", "status": "unaffected", "versionType": "rpm", "lessThan": "*" } ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7 Extended Lifecycle Support", "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected", "versions": [ { "version": "0:2.4.5-7.el7_9.4", "status": "unaffected", "versionType": "rpm", "lessThan": "*" } ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected", "versions": [ { "version": "0:3.1.8-1.el8_10.2", "status": "unaffected", "versionType": "rpm", "lessThan": "*" } ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support", "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected", "versions": [ { "version": "0:3.1.0-3.el8_4.3", "status": "unaffected", "versionType": "rpm", "lessThan": "*" } ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On", "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected", "versions": [ { "version": "0:3.1.0-3.el8_4.3", "status": "unaffected", "versionType": "rpm", "lessThan": "*" } ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected", "versions": [ { "version": "0:3.1.5-2.el8_6.2", "status": "unaffected", "versionType": "rpm", "lessThan": "*" } ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On", "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected", "versions": [ { "version": "0:3.1.5-2.el8_6.2", "status": "unaffected", "versionType": "rpm", "lessThan": "*" } ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service", "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected", "versions": [ { "version": "0:3.1.7-1.el8_8.2", "status": "unaffected", "versionType": "rpm", "lessThan": "*" } ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions", "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected", "versions": [ { "version": "0:3.1.7-1.el8_8.2", "status": "unaffected", "versionType": "rpm", "lessThan": "*" } ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected", "versions": [ { "version": "0:3.1.10-1.el9_8.2", "status": "unaffected", "versionType": "rpm", "lessThan": "*" } ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions", "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected", "versions": [ { "version": "0:3.1.7-1.el9_2.2", "status": "unaffected", "versionType": "rpm", "lessThan": "*" } ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions", "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected", "versions": [ { "version": "0:3.1.8-1.el9_4.2", "status": "unaffected", "versionType": "rpm", "lessThan": "*" } ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9.6 Extended Update Support", "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected", "versions": [ { "version": "0:3.1.9-2.el9_6.2", "status": "unaffected", "versionType": "rpm", "lessThan": "*" } ] }, { "vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4", "packageName": "openshift/ose-rhel-coreos-9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected", "versions": [] }, { "vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4", "packageName": "rhcos", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected", "versions": [] } ] } } }