CVE-2026-71194

Summary

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.

Affected Software

VendorProductVersion RangeStatus
OpenStackDesignate1.0.0 < 20.0.2affected
OpenStackDesignate21.0.0 < 21.0.1affected
OpenStackDesignate22.0.0 < 22.0.2affected

Weaknesses

  • CWE-669: CWE-669 Incorrect Resource Transfer Between Spheres

References