---
id: CVE-2026-10649
title: A flaw was found in Pacemaker
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, …
severity: high
cvss: 8.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H'
cwe:
  - CWE-190
  - CWE-190
published: '2026-06-16'
updated: '2026-07-16'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-10649'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:39322'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:39323'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:40833'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-10649'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2462817'
    label: secalert@redhat.com
  - url: 'https://github.com/clusterLabs/pacemaker/pull/4128'
    label: secalert@redhat.com
  - url: 'http://www.openwall.com/lists/oss-security/2026/06/16/6'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2026:39322'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:39323'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-10649'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2462817'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-10649.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00561
epssPercentile: 0.45229
ingestedAt: '2026-07-16T15:55:32.349Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.