CVE-2026-71193
Publication date 12 August 2026
Last updated 1 October 2026
Ubuntu priority
Description
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| designate | 26.04 LTS resolute |
Fixed 1:22.0.0-0ubuntu2.1
|
| 24.04 LTS noble |
Fixed 1:18.0.0-0ubuntu1.1
|
|
| 22.04 LTS jammy |
Fixed 1:14.0.4-0ubuntu1.1
|
|
| 20.04 LTS focal |
Fixed 1:10.0.2-0ubuntu1+esm1
|
|
| 18.04 LTS bionic |
Fixed 1:6.0.1-0ubuntu1.2+esm1
|
|
| 16.04 LTS xenial |
Fixed 1:2.1.0-0ubuntu1+esm1
|
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CVSS version: CVSS v3.0
Base score
9.6 · Critical
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8860-1
- OpenStack Designate vulnerability
- 1 October 2026