OpenStack Designate mDNS Pool-Blind Lookup (before 22.0.2)
CVE-2026-71194 Published on August 12, 2026
In OpenStack Designate before 22.0.2, the mDNS handler performs pool-blind lookups when resolving record queries and NOTIFY requests. When two zones with the same name exist across different pools, the lookup fails with a deterministic error, causing the handler to return REFUSED for all DNS queries through that path. The _handle_notify path is exploitable via a single unauthenticated UDP packet. This is independently reachable through the cross-tenant zone overlap described in a different recent CVE, and also affects legitimate same-tenant cross-pool configurations. BIND9 views do not mitigate this issue as mDNS is a shared service upstream of any view configuration.
Vulnerability Analysis
CVE-2026-71194 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
Incorrect Resource Transfer Between Spheres
The product does not properly transfer a resource/behavior to another sphere, or improperly imports a resource/behavior from another sphere, in a manner that provides unintended control over that resource.
Products Associated with CVE-2026-71194
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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 22.0.2 is affected.