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Fencer Vulns
critical 9.6

CVE-2026-71193 json

In OpenStack Designate before 22.0.1, zone creation checks (_is_subzone, _is_superzone, and the duplicate-zone DB constraint) are scoped to…

published 2026-08-12 2 mo ago modified 2026-10-24 15 d ago also EUVD-2026-57689

cvss
9.6
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 22.0.1, zone creation checks (_is_subzone, _is_superzone, and the duplicate-zone DB constraint) are scoped to the target pool only. An authenticated user can bypass these checks by scheduling a zone to a different pool via the AttributeFilter scheduler, creating an overlapping zone that conflicts with another tenant's zone. This enables cross-tenant DNS hijack (redirecting traffic to attacker-controlled IPs) and DNS denial of service (NODATA responses). Exploitation requires a multi-pool deployment with AttributeFilter enabled in scheduler_filters, which is a non-default but documented and supported configuration for self-service tiering.

Patch / fix

  • OpenStack Designate 20.0.2, 21.0.1, 22.0.1
  • 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-2026-71193

  • designate Ubuntu 22.04 LTS 1:14.0.4-0ubuntu1.1
  • designate Ubuntu 24.04 LTS 1:18.0.0-0ubuntu1.1
  • designate Ubuntu 26.04 LTS 1:22.0.0-0ubuntu2.1
  • designate Ubuntu Pro 16.04 LTS 1:2.1.0-0ubuntu1+esm1
  • designate Ubuntu Pro 18.04 LTS 1:6.0.1-0ubuntu1.2+esm1
  • designate Ubuntu Pro 20.04 LTS 1:10.0.2-0ubuntu1+esm1

ubuntu advisories UBUNTU-CVE-2026-71193

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2026-71193 updated cvss 4.3

openstack-designate: designate: cross-tenant DNS zone overlap via pool-scoped ownership checks when using AttributeFilter scheduler

  • 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

0.53% 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 9.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H

Affected products

  • OpenStack Designate

Classification

Weakness

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.