CVE-2026-71194

Published: Aug 12, 2026Updated: Sep 9, 2026 Sources: CVE List NVDCWE-669

6.8MEDIUM

NVD MITRE

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:HAttack Complexity

High

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:CScope

Changed

Impact

C:NConfidentiality

None

I:NIntegrity

None

A:HAvailability

High

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Weaknesses

CWE-669

Affected Products

OpenStack

oss-project·USaka openstack foundation

DesignateOn-premWeb App

Networking Infrastructure / dns-dhcp-ntp

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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References

https://launchpad.net/bugs/2160533

launchpad.net

https://security.openstack.org/ossa/OSSA-2026-034.html

security.openstack.org

https://www.openwall.com/lists/oss-security/2026/08/11/6

openwall.com

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