CVE-2026-71193

Severity: critical (CVSS 9.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-12 · updated 2026-10-24
Weakness: CWE-863

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.

Affected products

OpenStack Designate: from 1.0.0 before 20.0.2; from 21.0.0 before 21.0.1; from 22.0.0 before 22.0.1 — fixed in 20.0.2, 21.0.1, 22.0.1

How to fix

Upgrade to a fixed version: OpenStack Designate 20.0.2, 21.0.1, 22.0.1. Check the vendor advisory for mitigations.

References

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