{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-35091","assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","state":"PUBLISHED","assignerShortName":"redhat","dateReserved":"2026-04-01T11:35:23.145Z","datePublished":"2026-04-01T13:18:53.738Z","dateUpdated":"2026-05-13T07:59:08.889Z"},"containers":{"cna":{"title":"Corosync: corosync: denial of service and information disclosure via crafted udp packet","metrics":[{"other":{"content":{"value":"Moderate","namespace":"https://access.redhat.com/security/updates/classification/"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H","version":"3.1"},"format":"CVSS"}],"descriptions":[{"lang":"en","value":"A flaw was found in Corosync. A remote unauthenticated attacker can exploit a wrong return value vulnerability in the Corosync membership commit token sanity check by sending a specially crafted User Datagram Protocol (UDP) packet. This can lead to an out-of-bounds read, causing a denial of service (DoS) and potentially disclosing limited memory contents"}],"affected":[{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"corosync","defaultStatus":"affected","versions":[{"version":"0:3.1.9-2.el10_1.1","lessThan":"*","versionType":"rpm","status":"unaffected"}],"cpes":["cpe:/o:redhat:enterprise_linux:10.1"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10.0 Extended Update Support","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"corosync","defaultStatus":"affected","versions":[{"version":"0:3.1.9-1.el10_0.2","lessThan":"*","versionType":"rpm","status":"unaffected"}],"cpes":["cpe:/o:redhat:enterprise_linux_eus:10.0"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 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Check of Function Return Value","lang":"en","type":"CWE"}]}],"x_redhatCweChain":"CWE-253: Incorrect Check of Function Return Value","workarounds":[{"lang":"en","value":"Systems using totemudp or totemudpu should migrate to the supported knet transport and enable encryption.\n\nDisabling the Corosync service is a valid workaround if clustering is not required, but for active clusters, enabling encryption via knet is the preferred and recommended approach."}],"timeline":[{"lang":"en","time":"2026-04-01T11:31:01.742Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-04-01T11:48:13.254Z","value":"Made public."}],"credits":[{"lang":"en","value":"Red Hat would like to thank Sebastián Alba Vives for reporting this issue."}],"providerMetadata":{"orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","shortName":"redhat","dateUpdated":"2026-05-13T07:59:08.889Z"},"x_generator":{"engine":"cvelib 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