CVE-2026-35091 HIGH

CVE-2026-35091: Corosync: corosync: denial of service and information disclosure via crafted udp packet

Vendor Red Hat
Product Red Hat OpenShift Container Platform 4
Weakness CWE-253
Published April 1, 2026
Last update May 29, 2026

CVSS base score

8.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality Low
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

April 1, 2026 CVE published
May 29, 2026 Record updated