CVE-2026-71194
MEDIUM
MEDIUM
Priority: 0.04
BB Relevance:
64/100
Published: 2026-08-12
Modified: 2026-10-24
First seen: 2026-10-29
Status: active
Attack Surface
Network
No Auth
No Interaction
Scope Change
CVSS Vector Breakdown
AV:
Network
AC:
High
PR:
None
UI:
None
S:
Changed
C:
None
I:
None
A:
High
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.