CVE-2026-71194: Openstack Designate

Medium severity, CVSS 6.8. EPSS: 0.5% chance of exploitation in the next 30 days.

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 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 22.0.2 (fixed in 22.0.2)

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