---
id: CVE-2026-5367
title: A flaw was found in OVN (Open Virtual Network)
summary: >-
  A flaw was found in OVN (Open Virtual Network). A remote attacker, by sending
  crafted DHCPv6 (Dynamic Host Configuration Protocol for IPv6) SOLICIT packets
  with an inflated Client ID length, could cause the ovn-controller to read
  beyond …
severity: high
cvss: 8.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N'
cwe:
  - CWE-130
  - CWE-130
published: '2026-04-24'
updated: '2026-08-25'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-5367'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:11694'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:11695'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:11696'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:11698'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:11700'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:11701'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:11702'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:22110'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:22111'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-5367'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2455863'
    label: secalert@redhat.com
  - url: 'http://www.openwall.com/lists/oss-security/2026/04/20/3'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.openwall.com/lists/oss-security/2026/04/20/5'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2026:11694'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:11695'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:11696'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:11698'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:11700'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:11701'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:11702'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:22110'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:22111'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-5367'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2455863'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5367.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00868
epssPercentile: 0.57221
ingestedAt: '2026-08-25T13:26:20.198Z'
---

## Overview

A flaw was found in OVN (Open Virtual Network). A remote attacker, by sending crafted DHCPv6 (Dynamic Host Configuration Protocol for IPv6) SOLICIT packets with an inflated Client ID length, could cause the ovn-controller to read beyond the bounds of a packet. This out-of-bounds read can lead to the disclosure of sensitive information stored in heap memory, which is then returned to the attacker's virtual machine port.

## Remediation

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