Vulnerability · Published Aug 12, 2026 · Assigned by mitre
CVE-2026-71193
Critical 9.6
In plain English
A critical-severity incorrect authorization in Designate from OpenStack. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | designate | 1:15.0.2-0+deb11u1 | DEBIAN-CVE-2026-71193 |
| Debian:13 | designate | 1:20.0.0-2+deb13u1 | DEBIAN-CVE-2026-71193 |
| Debian:14 | designate | 1:22.0.0-2 | DEBIAN-CVE-2026-71193 |
| Ubuntu:22.04:LTS | designate | 1:14.0.4-0ubuntu1.1 | UBUNTU-CVE-2026-71193 |
| Ubuntu:22.04:LTS | designate | 1:14.0.4-0ubuntu1.1 | USN-8860-1 |
| Ubuntu:24.04:LTS | designate | 1:18.0.0-0ubuntu1.1 | USN-8860-1 |
| Ubuntu:24.04:LTS | designate | 1:18.0.0-0ubuntu1.1 | UBUNTU-CVE-2026-71193 |
| Ubuntu:26.04:LTS | designate | 1:22.0.0-0ubuntu2.1 | USN-8860-1 |
| Ubuntu:26.04:LTS | designate | 1:22.0.0-0ubuntu2.1 | UBUNTU-CVE-2026-71193 |
Affected products (as reported)
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
References
- https://launchpad.net/bugs/2160533 issue-tracking
- https://security.openstack.org/ossa/OSSA-2026-034.html vendor-advisory
- https://www.openwall.com/lists/oss-security/2026/08/11/6 vendor-advisory, mailing-list