CVE-2026-10649

Pacemaker: pacemaker: denial of service via integer overflow in remote message decompression

State: Published
Severity: 8.6 High
Published: Jun 16, 2026
Updated: Aug 21, 2026
Reserved: Jun 2, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.6 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H	redhat
3.1	8.6 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H	redhat-SADP

Weaknesses

CWE-190 Integer Overflow or Wraparound

Affected Products

Product	Versions
Red Hat Enterprise Linux 10Red Hat	0:3.0.1-5.el10_2.1 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat	0:3.0.0-5.3.el10_0 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:1.1.23-1.el7_9.2 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:2.1.7-5.6.el8_10 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:2.0.5-9.el8_4.12 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat	0:2.0.5-9.el8_4.12 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:2.1.2-4.el8_6.11 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat	0:2.1.2-4.el8_6.11 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat	0:2.1.5-9.7.el8_8 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat	0:2.1.5-9.7.el8_8 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:2.1.10-3.el9_8 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat	0:2.1.5-9.el9_2.7 and laterNot affected
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat	0:2.1.7-5.5.el9_4 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat	0:2.1.9-1.4.el9_6 and laterNot affected
Red Hat Enterprise Linux 6Red Hat
Red Hat OpenShift Container Platform 4Red Hat

References

RHSA-2026:39322vendor-advisory
RHSA-2026:39323vendor-advisory
RHSA-2026:40833vendor-advisory
RHSA-2026:41041vendor-advisory
RHSA-2026:41042vendor-advisory
RHSA-2026:41043vendor-advisory
RHSA-2026:41044vendor-advisory
RHSA-2026:42041vendor-advisory
RHSA-2026:42075vendor-advisory
RHSA-2026:42076vendor-advisory
RHSA-2026:43606vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-10649vdb-entry
RHBZ#2462817issue-tracking
https://github.com/clusterLabs/pacemaker/pull/4128
http://www.openwall.com/lists/oss-security/2026/06/16/6
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-10649.json

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