Vulnerability in OpenStack Designate
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (41.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- OpenStack Designate — versions 1.0.0, 21.0.0, 22.0.0
Weakness classification (CWE)
References
- launchpad.net/bugs/2160533 (issue-tracking)
- security.openstack.org/ossa/OSSA-2026-034.html (vendor-advisory)
- www.openwall.com/lists/oss-security/2026/08/11/6 (mailing-list, issue-tracking, vendor-advisory)
Frequently asked questions
- What is CVE-2026-71194?
- CVE-2026-71194 is a medium-severity vulnerability in OpenStack Designate, classified under Incorrect Resource Transfer Between Spheres. CVSS score: 6.8/10. Published 2026-08-12.
- How severe is CVE-2026-71194?
- Medium severity. CVSS v3 base score is 6.8 out of 10.