CVE-2026-71193: Openstack Designate

Critical severity, CVSS 9.6. EPSS: 0.5% chance of exploitation in the next 30 days.

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 products

• Openstack Designate: from 1.0.0, before 20.0.2 (fixed in 20.0.2); from 21.0.0, before 21.0.1 (fixed in 21.0.1); from 22.0.0, before 22.0.1 (fixed in 22.0.1)

Published 2026-08-12. Last modified 2026-09-09.