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Vulnerability · Published Apr 1, 2026 · Assigned by redhat

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

High 8.2

In plain English

A high-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.2High
Exploit odds (30 days)0.9%top 40.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10corosync3.1.9-2.el10_1.1ALSA-2026:13644
AlmaLinux:10corosync3.1.10-1.el10_2.1ALSA-2026:19043
AlmaLinux:8corosync3.1.8-1.el8_10.1ALSA-2026:13657
AlmaLinux:9corosync3.1.10-1.el9_8.1ALSA-2026:19200
AlmaLinux:9corosync3.1.9-2.el9_7.1ALSA-2026:13673
AlmaLinux:10corosync-vqsim3.1.9-2.el10_1.1ALSA-2026:13644
AlmaLinux:10corosync-vqsim3.1.10-1.el10_2.1ALSA-2026:19043
AlmaLinux:8corosync-vqsim3.1.8-1.el8_10.1ALSA-2026:13657
AlmaLinux:9corosync-vqsim3.1.9-2.el9_7.1ALSA-2026:13673
AlmaLinux:9corosync-vqsim3.1.10-1.el9_8.1ALSA-2026:19200
AlmaLinux:10corosynclib3.1.10-1.el10_2.1ALSA-2026:19043
AlmaLinux:10corosynclib3.1.9-2.el10_1.1ALSA-2026:13644
AlmaLinux:8corosynclib3.1.8-1.el8_10.1ALSA-2026:13657
AlmaLinux:9corosynclib3.1.9-2.el9_7.1ALSA-2026:13673
AlmaLinux:9corosynclib3.1.10-1.el9_8.1ALSA-2026:19200
AlmaLinux:10corosynclib-devel3.1.9-2.el10_1.1ALSA-2026:13644
AlmaLinux:10corosynclib-devel3.1.10-1.el10_2.1ALSA-2026:19043
AlmaLinux:8corosynclib-devel3.1.8-1.el8_10.1ALSA-2026:13657
AlmaLinux:9corosynclib-devel3.1.9-2.el9_7.1ALSA-2026:13673
AlmaLinux:9corosynclib-devel3.1.10-1.el9_8.1ALSA-2026:19200
AlmaLinux:8spausedd3.1.8-1.el8_10.1ALSA-2026:13657
Debian:12corosync3.1.7-1+deb12u2DEBIAN-CVE-2026-35091
Debian:13corosync3.1.9-2+deb13u1DEBIAN-CVE-2026-35091
Debian:14corosync3.1.10-2DEBIAN-CVE-2026-35091
Rocky Linux:10corosync0:3.1.10-1.el10_2.1RLSA-2026:19043
Rocky Linux:10corosync0:3.1.9-2.el10_1.1RLSA-2026:13644
Rocky Linux:8corosync0:3.1.8-1.el8_10.1RLSA-2026:13657
Rocky Linux:9corosync0:3.1.9-2.el9_7.1RLSA-2026:13673
Rocky Linux:9corosync0:3.1.10-1.el9_8.1RLSA-2026:19200
Ubuntu:22.04:LTScorosync3.1.6-1ubuntu1.2UBUNTU-CVE-2026-35091
Ubuntu:22.04:LTScorosync3.1.6-1ubuntu1.2USN-8170-1
Ubuntu:24.04:LTScorosync3.1.7-1ubuntu3.2USN-8170-1
Ubuntu:24.04:LTScorosync3.1.7-1ubuntu3.2UBUNTU-CVE-2026-35091
Ubuntu:25.10corosync3.1.9-2ubuntu1.1UBUNTU-CVE-2026-35091
Ubuntu:25.10corosync3.1.9-2ubuntu1.1USN-8170-1

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support see references
Red Hat Red Hat OpenShift Container Platform 4 see references

Weakness: CWE-253 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

References