---
id: CVE-2026-71194
title: >-
  In OpenStack Designate before 22.0.2, the mDNS handler performs pool-blind
  lookups when resolving record queries and NOTIFY requests
summary: >-
  In OpenStack Designate before 22.0.2, the mDNS handler performs pool-blind
  lookups when resolving record queries and NOTIFY requests. When two zones with
  the same name exist across different pools, the lookup fails with a
  deterministic e…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H'
cwe:
  - CWE-669
published: '2026-08-12'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T16:03:22.897'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71194'
references:
  - url: 'https://launchpad.net/bugs/2160533'
    label: cve@mitre.org
  - url: 'https://security.openstack.org/ossa/OSSA-2026-034.html'
    label: cve@mitre.org
  - url: 'https://www.openwall.com/lists/oss-security/2026/08/11/6'
    label: cve@mitre.org
tags:
  - nvd
epss: 0.00515
epssPercentile: 0.41345
ingestedAt: '2026-09-09T16:14:05.512Z'
---

## Overview

In OpenStack Designate before 22.0.2, the mDNS handler performs pool-blind lookups when resolving record queries and NOTIFY requests. When two zones with the same name exist across different pools, the lookup fails with a deterministic error, causing the handler to return REFUSED for all DNS queries through that path. The _handle_notify path is exploitable via a single unauthenticated UDP packet. This is independently reachable through the cross-tenant zone overlap described in a different recent CVE, and also affects legitimate same-tenant cross-pool configurations. BIND9 views do not mitigate this issue as mDNS is a shared service upstream of any view configuration.

## Remediation

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