OpenStack Designate before 22.0.1 Cross-Tenant DNS Hijack via AttributeFilter
CVE-2026-71193 Published on August 12, 2026
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.
Vulnerability Analysis
CVE-2026-71193 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity and availability.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2026-71193 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-71193
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Affected Versions
OpenStack Designate:- Version 1.0.0 and below 20.0.2 is affected.
- Version 21.0.0 and below 21.0.1 is affected.
- Version 22.0.0 and below 22.0.1 is affected.