What’s Vulnerable › Vulnerabilities

CVE-2026-71194

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-12 · updated 2026-10-24
• Weakness: CWE-669

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.

Affected products

• OpenStack Designate: from 1.0.0 before 20.0.2; from 21.0.0 before 21.0.1; from 22.0.0 before 22.0.2 — fixed in 20.0.2, 21.0.1, 22.0.2

How to fix

Upgrade to a fixed version: OpenStack Designate 20.0.2, 21.0.1, 22.0.2. Check the vendor advisory for mitigations.

References

• https://launchpad.net/bugs/2160533
• https://security.openstack.org/ossa/OSSA-2026-034.html
• https://www.openwall.com/lists/oss-security/2026/08/11/6

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