CVE-2026-10649: Pacemaker: pacemaker: denial of service via integer overflow in remote message decompression
- Is it exploited?
Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.
- How likely is exploitation in the next 30 days?
- 0.6%
EPSS score, percentile 46.6 of all scored records. A probability estimated by FIRST, not a report of exploitation.
- How severe?
- 8.6 High
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA has set no required action, because the vulnerability is not in KEV.
- Which versions are affected?
Unaffected 0:3.0.1-5.el10_2.1; 0:3.0.0-5.3.el10_0; 0:1.1.23-1.el7_9.2; 0:2.1.7-5.6.el8_10; 0:2.0.5-9.el8_4.12; 0:2.0.5-9.el8_4.12; and 8 more
Source: CISA KEV 2026.10.29, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.
What to do
Workaround (from the CVE record)
Disable the Pacemaker CIB remote listener if it is not actively used. If the listener is required, restrict network access to trusted hosts by configuring firewall rules to limit inbound connections to the `remote-port` or `remote-tls-port`. These actions reduce the attack surface by limiting unauthenticated network exposure to the vulnerable component. A restart of the Pacemaker service may be necessary for these changes to be fully applied.
Advisories and patches
- RHSA-2026:39322
- RHSA-2026:39323
- RHSA-2026:40833
- RHSA-2026:41041
- RHSA-2026:41042
- RHSA-2026:41043
- RHSA-2026:41044
- RHSA-2026:42041
- RHSA-2026:42075
- RHSA-2026:42076
- RHSA-2026:43606
This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Unaffected | 0:3.0.1-5.el10_2.1 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:3.0.0-5.3.el10_0 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:1.1.23-1.el7_9.2 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:2.1.7-5.6.el8_10 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:2.0.5-9.el8_4.12 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:2.0.5-9.el8_4.12 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:2.1.2-4.el8_6.11 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:2.1.2-4.el8_6.11 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:2.1.5-9.7.el8_8 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:2.1.5-9.7.el8_8 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:2.1.10-3.el9_8 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:2.1.5-9.el9_2.7 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:2.1.7-5.5.el9_4 |
Versions not listed are: affected.
| Status | Versions |
|---|---|
| Unaffected | 0:2.1.9-1.4.el9_6 |
Versions not listed are: affected.
| Status | Versions |
|---|
Versions not listed are: unaffected.
| Status | Versions |
|---|
Versions not listed are: unaffected.
Versions the record lists as unaffected: 0:3.0.1-5.el10_2.1, 0:3.0.0-5.3.el10_0, 0:1.1.23-1.el7_9.2, 0:2.1.7-5.6.el8_10, 0:2.0.5-9.el8_4.12, 0:2.1.2-4.el8_6.11, 0:2.1.5-9.7.el8_8, 0:2.1.10-3.el9_8.
Source: CVE List, as of . About the data.
About this vulnerability
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.
Summary: CVE record, as of .
- CISA has not added CVE-2026-10649 to its Known Exploited Vulnerabilities (KEV) catalog, as of 29 Oct 2026.
- The CVE record was published on 16 Jun 2026.
- The CVE record carries a CVSS v3.1 base score of 8.6 (High), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 0.6% (percentile 46.6), as of 29 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
- CISA's SSVC assessment in the CVE record: exploitation none, automatable yes, technical impact partial.
- The credits in the CVE record name AISLE as finder.
Source: CISA KEV 2026.10.29, as of ; CVE List, as of ; FIRST EPSS, as of . About the data.
Description
Pacemaker: pacemaker: denial of service via integer overflow in remote message decompression
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.
Source: CVE List, as of . About the data.
Weakness
CWE-190
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| CVE record last updated |
Known exploited Red Hat vulnerabilities
- CVE-2015-3246: Red Hat Libuser Race Condition Vulnerability
- CVE-2015-5287: Red Hat Automatic Bug Reporting Tool Privilege Escalation Vulnerability
- CVE-2018-14667: Red Hat JBoss RichFaces Framework Expression Language Injection Vulnerability
- CVE-2021-3560: Red Hat Polkit Incorrect Authorization Vulnerability
- CVE-2021-4034: Red Hat Polkit Out-of-Bounds Read and Write Vulnerability