CVE-2026-71193
OpenStack Designate Cross-Tenant Zone Overlap Vulnerability
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.
INFO
Published Date :
Aug. 12, 2026, 11:17 p.m.
Last Modified :
Aug. 12, 2026, 11:17 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 8254265b-2729-46b6-b9e3-3dfca2d5bfca | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update OpenStack Designate to version 22.0.1 or later.
- Review and adjust scheduler filter configurations.
- Monitor for suspicious DNS activity.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-71193.
| URL | Resource |
|---|---|
| https://launchpad.net/bugs/2160533 | |
| https://security.openstack.org/ossa/OSSA-2026-034.html | |
| https://www.openwall.com/lists/oss-security/2026/08/11/6 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-71193 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-71193
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-71193 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-71193 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Aug. 12, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://opendev.org/openstack/designate', 'vendor': 'OpenStack', 'product': 'Designate', 'versions': [{'status': 'affected', 'version': '1.0.0', 'lessThan': '20.0.2', 'versionType': 'semver'}, {'status': 'affected', 'version': '21.0.0', 'lessThan': '21.0.1', 'versionType': 'semver'}, {'status': 'affected', 'version': '22.0.0', 'lessThan': '22.0.1', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H Added CWE CWE-863 Added Reference https://launchpad.net/bugs/2160533 Added Reference https://security.openstack.org/ossa/OSSA-2026-034.html Added Reference https://www.openwall.com/lists/oss-security/2026/08/11/6