CVE-2026-35091

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

CVSS v3 8.2 HIGH

8.2^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:13644
https://access.redhat.com/errata/RHSA-2026:13657
https://access.redhat.com/errata/RHSA-2026:13673
https://access.redhat.com/errata/RHSA-2026:14205
https://access.redhat.com/errata/RHSA-2026:14210
https://access.redhat.com/errata/RHSA-2026:14211
https://access.redhat.com/errata/RHSA-2026:14212
https://access.redhat.com/errata/RHSA-2026:14213
https://access.redhat.com/errata/RHSA-2026:14214
https://access.redhat.com/errata/RHSA-2026:14215
https://access.redhat.com/errata/RHSA-2026:14216
https://access.redhat.com/errata/RHSA-2026:19043
https://access.redhat.com/errata/RHSA-2026:19200
https://access.redhat.com/errata/RHSA-2026:20916
https://access.redhat.com/security/cve/CVE-2026-35091	Third Party Advisory VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=2453169	Exploit Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2453813	Issue Tracking

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:corosync:corosync:-:::::::*
	cpe:2.3:a:redhat:openshift:4.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux:7.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux:8.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux:9.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux:10.0:::::::*

History

No history.

Information

Published : 2026-04-01 14:16

Updated : 2026-08-21 13:17

NVD link : CVE-2026-35091

Mitre link : CVE-2026-35091

CVE.ORG link : CVE-2026-35091

JSON object : View

Products Affected

corosync

corosync

redhat

openshift
enterprise_linux

CWE

CWE-253

Incorrect Check of Function Return Value

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["cpe:/a:redhat:rhel_eus:9.4::appstream", "cpe:/a:redhat:rhel_eus:9.4::crb", "cpe:/a:redhat:rhel_eus:9.4::highavailability", "cpe:/a:redhat:rhel_eus:9.4::resilientstorage"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9.4 Extended Update Support", "versions": [{"status": "unaffected", "version": "0:3.1.8-1.el9_4.1", "lessThan": "*", "versionType": "rpm"}], "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:rhel_eus:9.6::appstream", "cpe:/a:redhat:rhel_eus:9.6::crb", "cpe:/a:redhat:rhel_eus:9.6::highavailability", "cpe:/a:redhat:rhel_eus:9.6::resilientstorage"], "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9.6 Extended Update Support", "versions": [{"status": "unaffected", "version": "0:3.1.9-2.el9_6.1", "lessThan": "*", "versionType": "rpm"}], "packageName": "corosync", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:openshift:4"], "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": "unaffected"}]}], "published": "2026-04-01T14:16:57.040", "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:13644", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:13657", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:13673", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:14205", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:14210", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:14211", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:14212", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:14213", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:14214", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:14215", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:14216", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:19043", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:19200", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/errata/RHSA-2026:20916", "source": "secalert@redhat.com"}, {"url": "https://access.redhat.com/security/cve/CVE-2026-35091", "tags": ["Third Party Advisory", "VDB Entry"], "source": "secalert@redhat.com"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453169", "tags": ["Exploit", "Third Party Advisory"], "source": "secalert@redhat.com"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453813", "tags": ["Issue Tracking"], "source": "secalert@redhat.com"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-253"}]}], "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"}], "lastModified": "2026-08-21T13:17:36.803", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:corosync:corosync:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5008766D-B12C-48F2-A70A-2344860259C2"}, {"criteria": "cpe:2.3:a:redhat:openshift:4.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5F7E2F04-474D-4196-9CE8-242642990A16"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "142AD0DD-4CF3-4D74-9442-459CE3347E3A"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F4CFF558-3C47-480D-A2F0-BABF26042943"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7F6FB57C-2BC7-487C-96DD-132683AEB35D"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D65C2163-CFC2-4ABB-8F4E-CB09CEBD006C"}], "operator": "OR"}]}], "sourceIdentifier": "secalert@redhat.com"}