EUVD-2026-57692
GHSA-r7xh-5qq7-jh72
Severity by source
AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
AC:H reflects the mandatory pre-existing cross-pool zone conflict; PR:N applies to the NOTIFY trigger itself; S:C captures cross-tenant DNS disruption beyond the attacker's own zone scope.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Denial-of-service in OpenStack Designate's mDNS handler allows unauthenticated remote disruption of DNS resolution across all tenants sharing an affected pool path. The handler performs pool-blind zone lookups: when two zones with the same name exist across different pools - a condition reachable either through a separate cross-tenant zone overlap vulnerability or via legitimate cross-pool configurations - the lookup fails deterministically, causing the handler to return REFUSED for all DNS queries through that path. The _handle_notify trigger is reachable via a single unauthenticated UDP packet, with no public exploit code identified at time of analysis and no confirmed active exploitation in the CISA KEV catalog.
Technical ContextAI
OpenStack Designate (cpe:2.3:a:openstack:designate) is the DNS-as-a-Service component of OpenStack, managing authoritative DNS through pool constructs - logical groupings of backend DNS servers across which zones are distributed. The mDNS handler (Designate's internal mini-DNS service) is responsible for propagating zone changes and answering NOTIFY requests from backends. The vulnerability arises because this handler executes pool-blind lookups: it searches all pools simultaneously without scoping the query to the originating pool, creating an ambiguous resolution when identical zone names exist in multiple pools. CWE-669 (Incorrect Resource Transfer Between Spheres) precisely captures this flaw - zone records belonging to distinct pool namespaces are incorrectly merged during lookup, allowing the failure condition in one sphere to cascade as a hard error across the entire handler. BIND9 views - a standard mechanism for separating DNS response behavior by client network - operate downstream of the mDNS handler and therefore provide no isolation from this issue, as the shared mDNS service processes NOTIFY packets before any view logic is reached.
RemediationAI
Upgrade OpenStack Designate to version 20.0.2, 21.0.1, or 22.0.2 according to the applicable release train, as specified in OSSA-2026-034 (https://security.openstack.org/ossa/OSSA-2026-034.html) and the upstream Launchpad bug report at https://launchpad.net/bugs/2160533. If patching cannot be performed immediately, restrict UDP network access to the Designate mDNS handler port at the host or network level so that only trusted backend DNS agents and authorized management hosts can deliver NOTIFY packets; note this may interrupt legitimate zone propagation from non-whitelisted backends and requires coordination with the DNS backend topology before implementation. As a secondary compensating step, audit all zones for name collisions across pools and resolve any conflicts by migrating or renaming zones - eliminating the precondition directly removes the exploitable failure mode without requiring a firewall change. The vendor advisory explicitly states that BIND9 views are not a valid compensating control and should not be relied upon to mitigate this issue.
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