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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| 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 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | pacemaker | No fix yet | — |
| Debian 13 | pacemaker | No fix yet | — |
| Debian 12 | pacemaker | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | pacemaker | No fix yet | — |
| Ubuntu 26.04 LTS | pacemaker | No fix yet | — |
| Ubuntu 25.10 | pacemaker | No fix yet | — |
| Ubuntu 24.04 LTS | pacemaker | No fix yet | — |
| Ubuntu 22.04 LTS | pacemaker | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | pacemaker | No fix yet | — |
| Ubuntu 18.04 LTS | pacemaker | No fix yet | — |
| Ubuntu 16.04 LTS | pacemaker | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | pacemaker +9 | 3.0.1-5.el10_2.1 | RHSA-2026:40833 |
| RHEL 9 | pacemaker +10 | 2.1.10-3.el9_8 | RHSA-2026:39323 |
| RHEL 8 | pacemaker +10 | 2.1.7-5.6.el8_10 | RHSA-2026:39322 |
| RHEL 7 | pacemaker +8 | 1.1.23-1.el7_9.2 | RHSA-2026:43606 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | pacemaker +9 | 3.0.0-5.3.el10_0 | RHSA-2026:41041 |
| RHEL 9.6 EUS | pacemaker +10 | 2.1.9-1.4.el9_6 | RHSA-2026:41042 |
| RHEL 9.4 E4S | pacemaker +10 | 2.1.7-5.5.el9_4 | RHSA-2026:41043 |
| RHEL 9.2 E4S | pacemaker +9 | 2.1.5-9.el9_2.7 | RHSA-2026:41044 |
| RHEL 8.8 TUS | pacemaker +9 | 2.1.5-9.7.el8_8 | RHSA-2026:42041 |
| RHEL 8.8 E4S | pacemaker +9 | 2.1.5-9.7.el8_8 | RHSA-2026:42041 |
| RHEL 8.6 EUS Long Life | pacemaker +9 | 2.1.2-4.el8_6.11 | RHSA-2026:42076 |
| RHEL 8.6 AUS | pacemaker +3 | 2.1.2-4.el8_6.11 | RHSA-2026:42076 |
| RHEL 8.4 EUS Long Life | pacemaker +9 | 2.0.5-9.el8_4.12 | RHSA-2026:42075 |
| RHEL 8.4 AUS | pacemaker +9 | 2.0.5-9.el8_4.12 | RHSA-2026:42075 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | pacemaker +9 | 3.0.1-5.el10_2.1 | ALSA-2026:40833 |
| AlmaLinux 9 | pacemaker +10 | 2.1.10-3.el9_8 | ALSA-2026:39323 |
| AlmaLinux 8 | pacemaker +10 | 2.1.7-5.6.el8_10 | ALSA-2026:39322 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | pacemaker | 3.0.1-5.el10_2.1 | RLSA-2026:40833 |
| Rocky Linux 9 | pacemaker | 2.1.10-3.el9_8 | RLSA-2026:39323 |
| Rocky Linux 8 | pacemaker | 2.1.7-5.6.el8_10 | RLSA-2026:39322 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | pacemaker | 2.1.10+20260618.4bca25e3c1-150700.3.6.1 | SUSE-SU-2026:2719-1 |
| SLES 15 SP6 | pacemaker | 2.1.7+20231219.0f7f88312-150600.6.15.1 | SUSE-SU-2026:2716-1 |
| SLES 15 SP5 | pacemaker | 2.1.5+20221208.a3f44794f-150500.6.29.1 | SUSE-SU-2026:2701-1 |
| SLES 15 SP4 | pacemaker | 2.1.2+20211124.ada5c3b36-150400.4.39.1 | SUSE-SU-2026:2742-1 |
| SLES 12 SP5 | pacemaker | 1.1.24+20210811.f5abda0ee-3.52.1 | SUSE-SU-2026:2970-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | pacemaker | 3.0.0+20250218.64cd85422c-160000.4.1 | SUSE-SU-2026:24251-1, SUSE-SU-2026:22510-1 |
| SLES 16.0 | pacemaker | 3.0.0+20250218.64cd85422c-160000.4.1 | SUSE-SU-2026:24196-1, SUSE-SU-2026:22493-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | pacemaker | 3.0.2+20260616.4544f351-1.1 | openSUSE-SU-2026:11111-1 |
| openSUSE Leap 16.0 | pacemaker | 3.0.0+20250218.64cd85422c-160000.4.1 | openSUSE-SU-2026:22069-1, openSUSE-SU-2026:21196-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | pacemaker | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | pacemaker +5 | 2.1.10-3.0.1.el9_8 | ELSA-2026-39323 |
| Oracle Linux 8 | pacemaker +5 | 2.1.7-5.6.0.1.el8_10 | ELSA-2026-39322 |
Advisories 32
- ALSA-2026:39323 Important: pacemaker security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:40833 Important: pacemaker security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:39322 Important: pacemaker security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-2345 Red Hat Enterprise Linux (pacemaker): Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Oct 25, 2026
- SUSE-SU-2026:24251-1 Security update for pacemaker SUSE / openSUSE Security Updates · Oct 21, 2026
- SUSE-SU-2026:24196-1 Security update for pacemaker SUSE / openSUSE Security Updates · Oct 21, 2026
- openSUSE-SU-2026:22069-1 Security update for pacemaker SUSE / openSUSE Security Updates · Oct 19, 2026
- RHSA-2026:43606 Red Hat Security Advisory: pacemaker security update Red Hat Security Advisories (RHSA) · Aug 22, 2026
- RHSA-2026:42076 Red Hat Security Advisory: pacemaker security update Red Hat Security Advisories (RHSA) · Aug 22, 2026
- RHSA-2026:42075 Red Hat Security Advisory: pacemaker security update Red Hat Security Advisories (RHSA) · Aug 22, 2026
- RHSA-2026:42041 Red Hat Security Advisory: pacemaker security update Red Hat Security Advisories (RHSA) · Aug 22, 2026
- RHSA-2026:41044 Red Hat Security Advisory: pacemaker security update Red Hat Security Advisories (RHSA) · Aug 22, 2026
- RHSA-2026:41042 Red Hat Security Advisory: pacemaker security update Red Hat Security Advisories (RHSA) · Aug 22, 2026
- RHSA-2026:41043 Red Hat Security Advisory: pacemaker security update Red Hat Security Advisories (RHSA) · Aug 22, 2026
- RHSA-2026:41041 Red Hat Security Advisory: pacemaker security update Red Hat Security Advisories (RHSA) · Aug 22, 2026
- RHSA-2026:40833 Red Hat Security Advisory: pacemaker security update Red Hat Security Advisories (RHSA) · Aug 22, 2026
- RHSA-2026:39323 Red Hat Security Advisory: pacemaker security update Red Hat Security Advisories (RHSA) · Aug 22, 2026
- RHSA-2026:39322 Red Hat Security Advisory: pacemaker security update Red Hat Security Advisories (RHSA) · Aug 22, 2026
- RLSA-2026:40833 Important: pacemaker security update Rocky Linux Security Advisories · Jul 22, 2026
- ELSA-2026-39323 Important: pacemaker security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 21, 2026
- RLSA-2026:39322 Important: pacemaker security update Rocky Linux Security Advisories · Jul 15, 2026
- RLSA-2026:39323 Important: pacemaker security update Rocky Linux Security Advisories · Jul 15, 2026
- SUSE-SU-2026:2970-1 Security update for pacemaker SUSE / openSUSE Security Updates · Jul 15, 2026
- ELSA-2026-39322 Important: pacemaker security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 15, 2026
- SUSE-SU-2026:22510-1 Security update for pacemaker SUSE / openSUSE Security Updates · Jul 7, 2026
- SUSE-SU-2026:22493-1 Security update for pacemaker SUSE / openSUSE Security Updates · Jul 7, 2026
- SUSE-SU-2026:2742-1 Security update for pacemaker SUSE / openSUSE Security Updates · Jul 4, 2026
- openSUSE-SU-2026:21196-1 Security update for pacemaker SUSE / openSUSE Security Updates · Jul 3, 2026
- SUSE-SU-2026:2719-1 Security update for pacemaker SUSE / openSUSE Security Updates · Jul 2, 2026
- SUSE-SU-2026:2716-1 Security update for pacemaker SUSE / openSUSE Security Updates · Jul 1, 2026
- SUSE-SU-2026:2701-1 Security update for pacemaker SUSE / openSUSE Security Updates · Jul 1, 2026
- openSUSE-SU-2026:11111-1 pacemaker-3.0.2+20260616.4544f351-1.1 on GA media SUSE / openSUSE Security Updates · Jun 24, 2026
References
- RHSA-2026:39322 vendor-advisory
- RHSA-2026:39323 vendor-advisory
- RHSA-2026:40833 vendor-advisory
- RHSA-2026:41041 vendor-advisory
- RHSA-2026:41042 vendor-advisory
- RHSA-2026:41043 vendor-advisory
- RHSA-2026:41044 vendor-advisory
- RHSA-2026:42041 vendor-advisory
- RHSA-2026:42075 vendor-advisory
- RHSA-2026:42076 vendor-advisory
- RHSA-2026:43606 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-10649 vdb-entry
- RHBZ#2462817 issue-tracking
- https://github.com/clusterLabs/pacemaker/pull/4128