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Fencer Vulns
high 8.6

CVE-2026-10649 json

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

published 2026-06-16 4 mo ago modified 2026-11-04 4 d ago also EUVD-2026-37128

cvss
8.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 46%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:3.0.1-5.el10_2.1
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.0.0-5.3.el10_0
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:1.1.23-1.el7_9.2
  • Red Hat Red Hat Enterprise Linux 8 0:2.1.7-5.6.el8_10
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:2.0.5-9.el8_4.12
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:2.0.5-9.el8_4.12
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:2.1.2-4.el8_6.11
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:2.1.2-4.el8_6.11
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:2.1.5-9.7.el8_8
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:2.1.5-9.7.el8_8
  • Red Hat Red Hat Enterprise Linux 9 0:2.1.10-3.el9_8
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.1.5-9.el9_2.7
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:2.1.7-5.5.el9_4
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:2.1.9-1.4.el9_6
  • pacemaker RHEL 7 1.1.23-1.el7_9.2
  • pacemaker-cli RHEL 7 1.1.23-1.el7_9.2
  • pacemaker-cts RHEL 7 1.1.23-1.el7_9.2
  • pacemaker-libs RHEL 7 1.1.23-1.el7_9.2
  • pacemaker-remote RHEL 7 1.1.23-1.el7_9.2
  • pacemaker-cluster-libs RHEL 7 1.1.23-1.el7_9.2
  • pacemaker-nagios-plugins-metadata RHEL 7 1.1.23-1.el7_9.2
  • pacemaker RHEL 10.2 3.0.1-5.el10_2.1

red hat advisories RHSA-2026:43606RHSA-2026:42076RHSA-2026:42075RHSA-2026:42041RHSA-2026:41043RHSA-2026:41044

  • pacemaker SLE High Availability Extension 16.0, SLES for SAP applications 16.0 3.0.3+20260728.7052efa194-160000.1.1
  • pacemaker SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS, SLE High Availability Extension 12 SP5 1.1.24+20210811.f5abda0ee-3.52.1
  • pacemaker SLE High Availability Extension 15 SP4 2.1.2+20211124.ada5c3b36-150400.4.39.1
  • pacemaker SLE High Availability Extension 15 SP7 2.1.10+20260618.4bca25e3c1-150700.3.6.1
  • pacemaker SLE High Availability Extension 15 SP6 2.1.7+20231219.0f7f88312-150600.6.15.1
  • pacemaker SLE High Availability Extension 15 SP5 2.1.5+20221208.a3f44794f-150500.6.29.1
  • pacemaker SLE High Availability Extension 16.0, SLES for SAP applications 16.0 3.0.0+20250218.64cd85422c-160000.4.1

suse advisories SUSE-SU-2026:24196-1SUSE-SU-2026:24251-1SUSE-SU-2026:2970-1SUSE-SU-2026:2742-1SUSE-SU-2026:2719-1SUSE-SU-2026:2716-1

  • pacemaker openSUSE Leap 16.0 3.0.3+20260728.7052efa194-160000.1.1
  • pacemaker openSUSE Leap 16.0 3.0.0+20250218.64cd85422c-160000.4.1
  • pacemaker openSUSE Tumbleweed 3.0.2+20260616.4544f351-1.1

opensuse advisories openSUSE-SU-2026:22069-1openSUSE-SU-2026:21196-1openSUSE-SU-2026:11111-1

  • pacemaker AlmaLinux 10 3.0.1-5.el10_2.1
  • pacemaker-cli AlmaLinux 10 3.0.1-5.el10_2.1
  • pacemaker-cts AlmaLinux 10 3.0.1-5.el10_2.1
  • pacemaker-libs AlmaLinux 10 3.0.1-5.el10_2.1
  • pacemaker-remote AlmaLinux 10 3.0.1-5.el10_2.1
  • pacemaker-schemas AlmaLinux 10 3.0.1-5.el10_2.1
  • python3-pacemaker AlmaLinux 10 3.0.1-5.el10_2.1
  • pacemaker-cluster-libs AlmaLinux 10 3.0.1-5.el10_2.1

almalinux advisories ALSA-2026:40833ALSA-2026:39322ALSA-2026:39323

  • pacemaker Rocky Linux 10 3.0.1-5.el10_2.1
  • pacemaker Rocky Linux 9 2.1.10-3.el9_8
  • pacemaker Rocky Linux 8 2.1.7-5.6.el8_10

rocky linux advisories RLSA-2026:40833RLSA-2026:39323RLSA-2026:39322

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-10649 updated cvss 8.6

pacemaker: Pacemaker: Denial of Service via integer overflow in remote message decompression

  • Red Hat Enterprise Linux AppStream (v. 8) pacemaker 2.1.7-5.6.el8_10, pacemaker-libs 2.1.7-5.6.el8_10, pacemaker-schemas 2.1.7-5.6.el8_10, pacemaker-cluster-libs 2.1.7-5.6.el8_10
    fixed: vendor fix RHSA-2026:39322
  • Red Hat Enterprise Linux AppStream (v. 9) pacemaker 2.1.10-3.el9_8, pacemaker-libs 2.1.10-3.el9_8, pacemaker-schemas 2.1.10-3.el9_8, pacemaker-cluster-libs 2.1.10-3.el9_8
    fixed: vendor fix RHSA-2026:39323
  • Red Hat Enterprise Linux AppStream (v. 10) pacemaker 3.0.1-5.el10_2.1, pacemaker-libs 3.0.1-5.el10_2.1, pacemaker-schemas 3.0.1-5.el10_2.1, pacemaker-cluster-libs 3.0.1-5.el10_2.1
    fixed: vendor fix RHSA-2026:40833
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) pacemaker 2.0.5-9.el8_4.12, pacemaker-libs 2.0.5-9.el8_4.12, pacemaker-schemas 2.0.5-9.el8_4.12, pacemaker-cluster-libs 2.0.5-9.el8_4.12
    fixed: vendor fix RHSA-2026:42075
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) pacemaker 2.1.2-4.el8_6.11, pacemaker-libs 2.1.2-4.el8_6.11, pacemaker-schemas 2.1.2-4.el8_6.11, pacemaker-cluster-libs 2.1.2-4.el8_6.11
    fixed: vendor fix RHSA-2026:42076
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) pacemaker 2.1.5-9.7.el8_8, pacemaker-libs 2.1.5-9.7.el8_8, pacemaker-schemas 2.1.5-9.7.el8_8, pacemaker-cluster-libs 2.1.5-9.7.el8_8
    fixed: vendor fix RHSA-2026:42041
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) pacemaker 3.0.0-5.3.el10_0, pacemaker-libs 3.0.0-5.3.el10_0, pacemaker-schemas 3.0.0-5.3.el10_0, pacemaker-cluster-libs 3.0.0-5.3.el10_0
    fixed: vendor fix RHSA-2026:41041
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) pacemaker 2.1.9-1.4.el9_6, pacemaker-libs 2.1.9-1.4.el9_6, pacemaker-schemas 2.1.9-1.4.el9_6, pacemaker-cluster-libs 2.1.9-1.4.el9_6
    fixed: vendor fix RHSA-2026:41042
show 23 more
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) pacemaker 2.0.5-9.el8_4.12, pacemaker-libs 2.0.5-9.el8_4.12, pacemaker-schemas 2.0.5-9.el8_4.12, pacemaker-cluster-libs 2.0.5-9.el8_4.12
    fixed: vendor fix RHSA-2026:42075
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) pacemaker 2.1.2-4.el8_6.11, pacemaker-libs 2.1.2-4.el8_6.11, pacemaker-schemas 2.1.2-4.el8_6.11, pacemaker-cluster-libs 2.1.2-4.el8_6.11
    fixed: vendor fix RHSA-2026:42076
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) pacemaker 2.1.5-9.7.el8_8, pacemaker-libs 2.1.5-9.7.el8_8, pacemaker-schemas 2.1.5-9.7.el8_8, pacemaker-cluster-libs 2.1.5-9.7.el8_8
    fixed: vendor fix RHSA-2026:42041
  • Red Hat Enterprise Linux High Availability (v. 9) pacemaker 2.1.10-3.el9_8, pacemaker-cli 2.1.10-3.el9_8, pacemaker-cts 2.1.10-3.el9_8, pacemaker-remote 2.1.10-3.el9_8, python3-pacemaker 2.1.10-3.el9_8, pacemaker-nagios-plugins-metadata 2.1.10-3.el9_8
    fixed: vendor fix RHSA-2026:39323
  • Red Hat Enterprise Linux High Availability (v. 10) pacemaker 3.0.1-5.el10_2.1, pacemaker-cli 3.0.1-5.el10_2.1, pacemaker-cts 3.0.1-5.el10_2.1, pacemaker-remote 3.0.1-5.el10_2.1, python3-pacemaker 3.0.1-5.el10_2.1
    fixed: vendor fix RHSA-2026:40833
  • Red Hat Enterprise Linux High Availability AUS (v.8.4) pacemaker 2.0.5-9.el8_4.12, pacemaker-cli 2.0.5-9.el8_4.12, pacemaker-cts 2.0.5-9.el8_4.12, pacemaker-remote 2.0.5-9.el8_4.12, pacemaker-nagios-plugins-metadata 2.0.5-9.el8_4.12
    fixed: vendor fix RHSA-2026:42075
  • Red Hat Enterprise Linux High Availability E4S (v.8.8) pacemaker 2.1.5-9.7.el8_8, pacemaker-cli 2.1.5-9.7.el8_8, pacemaker-cts 2.1.5-9.7.el8_8, pacemaker-remote 2.1.5-9.7.el8_8, pacemaker-nagios-plugins-metadata 2.1.5-9.7.el8_8
    fixed: vendor fix RHSA-2026:42041
  • Red Hat Enterprise Linux High Availability E4S (v.9.2) pacemaker 2.1.5-9.el9_2.7, pacemaker-cli 2.1.5-9.el9_2.7, pacemaker-cts 2.1.5-9.el9_2.7, pacemaker-libs 2.1.5-9.el9_2.7, pacemaker-remote 2.1.5-9.el9_2.7, pacemaker-schemas 2.1.5-9.el9_2.7, +2 more
    fixed: vendor fix RHSA-2026:41044
  • Red Hat Enterprise Linux High Availability E4S (v.9.4) pacemaker 2.1.7-5.5.el9_4, pacemaker-cli 2.1.7-5.5.el9_4, pacemaker-cts 2.1.7-5.5.el9_4, pacemaker-libs 2.1.7-5.5.el9_4, pacemaker-remote 2.1.7-5.5.el9_4, pacemaker-schemas 2.1.7-5.5.el9_4, +3 more
    fixed: vendor fix RHSA-2026:41043
  • Red Hat Enterprise Linux High Availability EUS (v. 10.0) pacemaker 3.0.0-5.3.el10_0, pacemaker-cli 3.0.0-5.3.el10_0, pacemaker-cts 3.0.0-5.3.el10_0, pacemaker-remote 3.0.0-5.3.el10_0, python3-pacemaker 3.0.0-5.3.el10_0
    fixed: vendor fix RHSA-2026:41041
  • Red Hat Enterprise Linux High Availability EUS (v.9.6) pacemaker 2.1.9-1.4.el9_6, pacemaker-cli 2.1.9-1.4.el9_6, pacemaker-cts 2.1.9-1.4.el9_6, pacemaker-remote 2.1.9-1.4.el9_6, python3-pacemaker 2.1.9-1.4.el9_6, pacemaker-nagios-plugins-metadata 2.1.9-1.4.el9_6
    fixed: vendor fix RHSA-2026:41042
  • Red Hat Enterprise Linux High Availability EUS EXTENSION (v.8.6) pacemaker 2.1.2-4.el8_6.11, pacemaker-cli 2.1.2-4.el8_6.11, pacemaker-cts 2.1.2-4.el8_6.11, pacemaker-remote 2.1.2-4.el8_6.11, pacemaker-nagios-plugins-metadata 2.1.2-4.el8_6.11
    fixed: vendor fix RHSA-2026:42076
  • Red Hat Enterprise Linux High Availability TUS (v.8.8) pacemaker 2.1.5-9.7.el8_8, pacemaker-cli 2.1.5-9.7.el8_8, pacemaker-cts 2.1.5-9.7.el8_8, pacemaker-remote 2.1.5-9.7.el8_8, pacemaker-nagios-plugins-metadata 2.1.5-9.7.el8_8
    fixed: vendor fix RHSA-2026:42041
  • Red Hat Enterprise Linux HighAvailability (v. 8) pacemaker 2.1.7-5.6.el8_10, pacemaker-cli 2.1.7-5.6.el8_10, pacemaker-cts 2.1.7-5.6.el8_10, pacemaker-remote 2.1.7-5.6.el8_10, python3-pacemaker 2.1.7-5.6.el8_10, pacemaker-nagios-plugins-metadata 2.1.7-5.6.el8_10
    fixed: vendor fix RHSA-2026:39322
  • Red Hat Enterprise Linux HighAvailability EUS EXTENSION (v.8.4) pacemaker 2.0.5-9.el8_4.12, pacemaker-cli 2.0.5-9.el8_4.12, pacemaker-cts 2.0.5-9.el8_4.12, pacemaker-remote 2.0.5-9.el8_4.12, pacemaker-nagios-plugins-metadata 2.0.5-9.el8_4.12
    fixed: vendor fix RHSA-2026:42075
  • Red Hat Enterprise Linux Resilient Storage (v. 9) pacemaker 2.1.10-3.el9_8, pacemaker-cli 2.1.10-3.el9_8, pacemaker-cts 2.1.10-3.el9_8, pacemaker-remote 2.1.10-3.el9_8, python3-pacemaker 2.1.10-3.el9_8, pacemaker-nagios-plugins-metadata 2.1.10-3.el9_8
    fixed: vendor fix RHSA-2026:39323
  • Red Hat Enterprise Linux Resilient Storage E4S (v.9.2) pacemaker 2.1.5-9.el9_2.7, pacemaker-cli 2.1.5-9.el9_2.7, pacemaker-cts 2.1.5-9.el9_2.7, pacemaker-libs 2.1.5-9.el9_2.7, pacemaker-remote 2.1.5-9.el9_2.7, pacemaker-schemas 2.1.5-9.el9_2.7, +2 more
    fixed: vendor fix RHSA-2026:41044
  • Red Hat Enterprise Linux Resilient Storage E4S (v.9.4) pacemaker 2.1.7-5.5.el9_4, pacemaker-cli 2.1.7-5.5.el9_4, pacemaker-cts 2.1.7-5.5.el9_4, pacemaker-libs 2.1.7-5.5.el9_4, pacemaker-remote 2.1.7-5.5.el9_4, pacemaker-schemas 2.1.7-5.5.el9_4, +3 more
    fixed: vendor fix RHSA-2026:41043
  • Red Hat Enterprise Linux Resilient Storage EUS (v.9.6) pacemaker 2.1.9-1.4.el9_6, pacemaker-cli 2.1.9-1.4.el9_6, pacemaker-cts 2.1.9-1.4.el9_6, pacemaker-remote 2.1.9-1.4.el9_6, python3-pacemaker 2.1.9-1.4.el9_6, pacemaker-nagios-plugins-metadata 2.1.9-1.4.el9_6
    fixed: vendor fix RHSA-2026:41042
  • Red Hat Enterprise Linux ResilientStorage (v. 8) pacemaker 2.1.7-5.6.el8_10, pacemaker-cli 2.1.7-5.6.el8_10, pacemaker-cts 2.1.7-5.6.el8_10, pacemaker-remote 2.1.7-5.6.el8_10, python3-pacemaker 2.1.7-5.6.el8_10, pacemaker-nagios-plugins-metadata 2.1.7-5.6.el8_10
    fixed: vendor fix RHSA-2026:39322
  • Red Hat Enterprise Linux Server HighAvailability (v. 7 ELS) pacemaker 1.1.23-1.el7_9.2, pacemaker-cli 1.1.23-1.el7_9.2, pacemaker-cts 1.1.23-1.el7_9.2, pacemaker-libs 1.1.23-1.el7_9.2, pacemaker-remote 1.1.23-1.el7_9.2, pacemaker-cluster-libs 1.1.23-1.el7_9.2, +1 more Red Hat Enterprise Linux Server ResilientStorage (v. 7 ELS) pacemaker 1.1.23-1.el7_9.2, pacemaker-cli 1.1.23-1.el7_9.2, pacemaker-cts 1.1.23-1.el7_9.2, pacemaker-libs 1.1.23-1.el7_9.2, pacemaker-remote 1.1.23-1.el7_9.2, pacemaker-cluster-libs 1.1.23-1.el7_9.2, +1 more
    fixed: vendor fix RHSA-2026:43606
  • Red Hat Enterprise Linux 6 pacemaker, pacemaker-cli, pacemaker-cts, pacemaker-libs, pacemaker-remote, pacemaker-cluster-libs
    not affected: component not present
  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    not affected: vulnerable code not in execute path

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.56% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
CISA ADP 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Container Platform 5

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.