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Fencer Vulns
medium 6.8

CVE-2026-71194 json

In OpenStack Designate before 22.0.2, the mDNS handler performs pool-blind lookups when resolving record queries and NOTIFY requests.

published 2026-08-12 2 mo ago modified 2026-10-24 15 d ago also EUVD-2026-57692

cvss
6.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

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.

Patch / fix

  • OpenStack Designate 20.0.2, 21.0.1, 22.0.2
  • designate Debian 12 1:15.0.2-0+deb11u1
  • designate Debian 13 1:20.0.0-2+deb13u1
  • designate Debian 14 1:22.0.0-2

debian advisories DEBIAN-CVE-2026-71194

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-71194 updated cvss 4.3

openstack-designate: designate: mDNS NOTIFY handler DoS via pool-blind zone lookup

  • Red Hat OpenStack Platform 13 (Queens) python-designate, python-designate-tests, openstack-designate-api, openstack-designate-mdns, openstack-designate-sink, openstack-designate-agent, +6 more Red Hat OpenStack Platform 16.2 python3-designate, openstack-designate-api, openstack-designate-mdns, openstack-designate-sink, openstack-designate-agent, openstack-designate-common, +3 more Red Hat OpenStack Platform 17.1 python3-designate, openstack-designate-api, openstack-designate-mdns, openstack-designate-sink, openstack-designate-agent, openstack-designate-common, +3 more Red Hat OpenStack Platform 18.0 openstack-designate 16.0.2-18.0.20240620195552.ff1986c.el9ost
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

Affected products

  • OpenStack Designate

Classification

Weakness
  • CWE-669 Incorrect Resource Transfer Between Spheres

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.