---
id: CVE-2026-71193
title: >-
  In OpenStack Designate before 22.0.1, zone creation checks (_is_subzone,
  _is_superzone, and the duplicate-zone DB constraint) are scoped to the target
  pool only
summary: >-
  In OpenStack Designate before 22.0.1, zone creation checks (_is_subzone,
  _is_superzone, and the duplicate-zone DB constraint) are scoped to the target
  pool only. An authenticated user can bypass these checks by scheduling a zone
  to a dif…
severity: critical
cvss: 9.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H'
cwe:
  - CWE-863
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-2026-71193'
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: 0.0037
epssPercentile: 0.30887
ingestedAt: '2026-09-09T16:14:05.512Z'
---

## Overview

In OpenStack Designate before 22.0.1, zone creation checks (_is_subzone, _is_superzone, and the duplicate-zone DB constraint) are scoped to the target pool only. An authenticated user can bypass these checks by scheduling a zone to a different pool via the AttributeFilter scheduler, creating an overlapping zone that conflicts with another tenant's zone. This enables cross-tenant DNS hijack (redirecting traffic to attacker-controlled IPs) and DNS denial of service (NODATA responses). Exploitation requires a multi-pool deployment with AttributeFilter enabled in scheduler_filters, which is a non-default but documented and supported configuration for self-service tiering.

## Remediation

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