---
cve: "CVE-2026-71193"
severity: "CRITICAL"
cvss: 9.6
epss: "52%"
vendor: "OpenStack"
kev: false
exploited: false
published: "2026-08-12 23:17:22"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-05T23:42:49+02:00"
---

# CVE-2026-71193

> 9.6 CRITICAL

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Keine | good |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- b5255cf54363bdb0775b51cc0fbf38eeb28aecae (Commit)
- 2ee5e4a00bc632283a4b5c5da1a94d8f184d1272 (Commit)

## Referenzen

- <https://launchpad.net/bugs/2160533>
- <https://security.openstack.org/ossa/OSSA-2026-034.html>
- <https://www.openwall.com/lists/oss-security/2026/08/11/6>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-71193) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_