CVE-2026-71193
CriticalCVSS 9.6Summary
In OpenStack Designate before 22.0.1, zone creation checks are scoped to the target pool only. An authenticated user can bypass them 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 and DNS denial of service.
Risk Assessment
DNS hijacking can redirect client traffic to attacker-controlled IPs, and DoS can prevent name resolution, leading to service unavailability.
Recommendation
Update OpenStack Designate to version 22.0.1 or later, which includes the fix.
Original NVD description (English source)
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.