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NVD 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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
CVE-2026-71194 OpenStack Designate mDNS Blind Lookup Vulnerability Leads to DNS Query Refusal https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-71194
Post summary
The post announces CVE-2026-71194, detailing an mDNS blind lookup flaw in OpenStack Designate that can cause DNS query refusals, but provides no evidence of exploitation, PoC, or available patches.