---
id: CVE-2026-35091
title: A flaw was found in Corosync
summary: >-
  A flaw was found in Corosync. A remote unauthenticated attacker can exploit a
  wrong return value vulnerability in the Corosync membership commit token
  sanity check by sending a specially crafted User Datagram Protocol (UDP)
  packet. This …
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H'
cwe:
  - CWE-253
vendor: corosync
product: corosync
affected:
  - corosync
  - openshift = 4.0
  - enterprise_linux = 7.0
  - enterprise_linux = 8.0
  - enterprise_linux = 9.0
  - enterprise_linux = 10.0
published: '2026-04-01'
updated: '2026-08-21'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-35091'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:13644'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:13657'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:13673'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:14205'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:14210'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:14211'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:14212'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:14213'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:14214'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:14215'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:14216'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:19043'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:19200'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:20916'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-35091'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2453169'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2453813'
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.01094
epssPercentile: 0.64037
ingestedAt: '2026-08-21T14:17:57.821Z'
---

## Overview

A flaw was found in Corosync. A remote unauthenticated attacker can exploit a wrong return value vulnerability in the Corosync membership commit token sanity check by sending a specially crafted User Datagram Protocol (UDP) packet. This can lead to an out-of-bounds read, causing a denial of service (DoS) and potentially disclosing limited memory contents

## Affected

- `corosync`
- `openshift = 4.0`
- `enterprise_linux = 7.0`
- `enterprise_linux = 8.0`
- `enterprise_linux = 9.0`
- `enterprise_linux = 10.0`

## Remediation

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