CVE-2026-71194 | BDVDB-2026-358463 Detail

Description#

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.

Impact#

Weaknesses#

References#

Exploit#

History#

1. Version 12026-08-12Record published in the CVE List.
2. Version 22026-08-13Most recent update recorded in the CVE List.