CVE-2026-71194
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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 6.8
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
- EPSS probability
- 0.30%
- CWE
- CWE-669
- Published
- 2026-08-12
- Last modified
- 2026-08-13
Affected products
- OpenStack Designate
- OpenStack Designate
- OpenStack Designate
Weakness type
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