A flaw was found in Corosync. An integer overflow vulnerability in Corosync's join message sanity validation allows a remote, unauthenticated attacker to send crafted User Datagram Protocol (UDP) packets. This can cause the service to crash, leading to a denial of service. This vulnerability specifically affects Corosync deployments configured to use totemudp/totemudpu mode.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

Restrict network access to Corosync cluster communication ports. Configure firewall rules to limit incoming UDP traffic to the Corosync service (default port 5405) to only trusted hosts within the cluster. This will prevent unauthenticated remote attackers from sending crafted packets to exploit the vulnerability. A service restart may be required for firewall changes to take full effect.

History

Thu, 02 Apr 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Wed, 01 Apr 2026 23:45:00 +0000

Type Values Removed Values Added
Description A flaw was found in Corosync. An integer overflow vulnerability in Corosync's join message sanity validation allows a remote, unauthenticated attacker to send crafted User Datagram Protocol (UDP) packets. This can cause the service to crash, leading to a denial of service. This vulnerability specifically affects Corosync deployments configured to use totemudp/totemudpu mode.
Title Corosync: corosync: denial of service via integer overflow in join message validation
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
Weaknesses CWE-190
CPEs cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat openshift
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-04-01T13:32:35.483Z

Reserved: 2026-04-01T11:35:23.146Z

Link: CVE-2026-35092

cve-icon Vulnrichment

Updated: 2026-04-01T13:30:10.667Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-04-01T14:16:57.237

Modified: 2026-04-01T14:23:37.727

Link: CVE-2026-35092

cve-icon Redhat

Severity : Important

Publid Date: 2026-04-01T11:48:22Z

Links: CVE-2026-35092 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses