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.
History

Wed, 12 Aug 2026 22:45:00 +0000

Type Values Removed Values Added
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.
First Time appeared Openstack
Openstack designate
Weaknesses CWE-669
CPEs cpe:2.3:a:openstack:designate:*:*:*:*:*:*:*:*
Vendors & Products Openstack
Openstack designate
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-08-12T22:23:46.951Z

Reserved: 2026-08-05T05:15:39.832Z

Link: CVE-2026-71194

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-12T23:17:22.170

Modified: 2026-08-12T23:17:22.170

Link: CVE-2026-71194

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-13T00:15:04Z