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Vulnerability · Published Jun 16, 2026 · Assigned by redhat

CVE-2026-10649Pacemaker: pacemaker: denial of service via integer overflow in remote message decompression

High 8.6

In plain English

A high-severity integer overflow 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 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.6High
Exploit odds (30 days)0.6%top 53.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in Pacemaker. An unauthenticated remote attacker can exploit an integer overflow vulnerability in the remote message decompression process. By sending a specially crafted compressed remote message before authentication, an attacker can cause memory corruption, leading to a denial of service (DoS) in the CIB remote listener. This can result in the affected service crashing.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10pacemaker3.0.1-5.el10_2.1ALSA-2026:40833
AlmaLinux:8pacemaker2.1.7-5.6.el8_10ALSA-2026:39322
AlmaLinux:9pacemaker2.1.10-3.el9_8ALSA-2026:39323
AlmaLinux:10pacemaker-cli3.0.1-5.el10_2.1ALSA-2026:40833
AlmaLinux:8pacemaker-cli2.1.7-5.6.el8_10ALSA-2026:39322
AlmaLinux:9pacemaker-cli2.1.10-3.el9_8ALSA-2026:39323
AlmaLinux:10pacemaker-cluster-libs3.0.1-5.el10_2.1ALSA-2026:40833
AlmaLinux:8pacemaker-cluster-libs2.1.7-5.6.el8_10ALSA-2026:39322
AlmaLinux:9pacemaker-cluster-libs2.1.10-3.el9_8ALSA-2026:39323
AlmaLinux:10pacemaker-cts3.0.1-5.el10_2.1ALSA-2026:40833
AlmaLinux:8pacemaker-cts2.1.7-5.6.el8_10ALSA-2026:39322
AlmaLinux:9pacemaker-cts2.1.10-3.el9_8ALSA-2026:39323
AlmaLinux:10pacemaker-doc3.0.1-5.el10_2.1ALSA-2026:40833
AlmaLinux:8pacemaker-doc2.1.7-5.6.el8_10ALSA-2026:39322
AlmaLinux:9pacemaker-doc2.1.10-3.el9_8ALSA-2026:39323
AlmaLinux:10pacemaker-libs3.0.1-5.el10_2.1ALSA-2026:40833
AlmaLinux:8pacemaker-libs2.1.7-5.6.el8_10ALSA-2026:39322
AlmaLinux:9pacemaker-libs2.1.10-3.el9_8ALSA-2026:39323
AlmaLinux:10pacemaker-libs-devel3.0.1-5.el10_2.1ALSA-2026:40833
AlmaLinux:8pacemaker-libs-devel2.1.7-5.6.el8_10ALSA-2026:39322
AlmaLinux:9pacemaker-libs-devel2.1.10-3.el9_8ALSA-2026:39323
AlmaLinux:8pacemaker-nagios-plugins-metadata2.1.7-5.6.el8_10ALSA-2026:39322
AlmaLinux:9pacemaker-nagios-plugins-metadata2.1.10-3.el9_8ALSA-2026:39323
AlmaLinux:10pacemaker-remote3.0.1-5.el10_2.1ALSA-2026:40833
AlmaLinux:8pacemaker-remote2.1.7-5.6.el8_10ALSA-2026:39322
AlmaLinux:9pacemaker-remote2.1.10-3.el9_8ALSA-2026:39323
AlmaLinux:10pacemaker-schemas3.0.1-5.el10_2.1ALSA-2026:40833
AlmaLinux:8pacemaker-schemas2.1.7-5.6.el8_10ALSA-2026:39322
AlmaLinux:9pacemaker-schemas2.1.10-3.el9_8ALSA-2026:39323
AlmaLinux:10python3-pacemaker3.0.1-5.el10_2.1ALSA-2026:40833
AlmaLinux:8python3-pacemaker2.1.7-5.6.el8_10ALSA-2026:39322
AlmaLinux:9python3-pacemaker2.1.10-3.el9_8ALSA-2026:39323
Debian:12pacemakerno fix listedDEBIAN-CVE-2026-10649
Debian:13pacemakerno fix listedDEBIAN-CVE-2026-10649
Debian:14pacemakerno fix listedDEBIAN-CVE-2026-10649
Rocky Linux:10pacemaker0:3.0.1-5.el10_2.1RLSA-2026:40833
Rocky Linux:8pacemaker0:2.1.7-5.6.el8_10RLSA-2026:39322
Rocky Linux:9pacemaker0:2.1.10-3.el9_8RLSA-2026:39323
Ubuntu:22.04:LTSpacemakerno fix listedUBUNTU-CVE-2026-10649
Ubuntu:24.04:LTSpacemakerno fix listedUBUNTU-CVE-2026-10649
Ubuntu:25.10pacemakerno fix listedUBUNTU-CVE-2026-10649
Ubuntu:26.04:LTSpacemakerno fix listedUBUNTU-CVE-2026-10649
Ubuntu:26.10pacemakerno fix listedUBUNTU-CVE-2026-10649

Affected products (as reported)

VendorProductVersions
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 Extended Update Support Long-Life Add-On 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 9.2 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 5 see references

Weakness: CWE-190 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

References