Vulnerability · Published Aug 12, 2026 · Assigned by mitre
CVE-2026-71194
Medium 6.8
In plain English
A medium-severity security flaw in Designate from OpenStack. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | designate | 1:15.0.2-0+deb11u1 | DEBIAN-CVE-2026-71194 |
| Debian:13 | designate | 1:20.0.0-2+deb13u1 | DEBIAN-CVE-2026-71194 |
| Debian:14 | designate | 1:22.0.0-2 | DEBIAN-CVE-2026-71194 |
| Ubuntu:22.04:LTS | designate | no fix listed | UBUNTU-CVE-2026-71194 |
| Ubuntu:24.04:LTS | designate | no fix listed | UBUNTU-CVE-2026-71194 |
| Ubuntu:26.04:LTS | designate | no fix listed | UBUNTU-CVE-2026-71194 |
| Ubuntu:26.10 | designate | no fix listed | UBUNTU-CVE-2026-71194 |
Affected products (as reported)
Weakness: CWE-669 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
References
- https://launchpad.net/bugs/2160533 issue-tracking
- https://security.openstack.org/ossa/OSSA-2026-034.html vendor-advisory
- https://www.openwall.com/lists/oss-security/2026/08/11/6 issue-tracking, vendor-advisory, mailing-list