{"schemaVersion":3,"id":"CVE-2026-71193","aliases":["UBUNTU-CVE-2026-71193","USN-8860-1","DEBIAN-CVE-2026-71193"],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-08-12T22:17:12.516Z","modified":"2026-08-13T13:35:19.251Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.6,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":9.6,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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1:22.0.0-2","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"designate","name":"designate","label":"designate","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/designate","purlType":"deb","versions":[{"text":"< 1:2.1.0-0ubuntu1+esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 1:6.0.1-0ubuntu1.2+esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 1:10.0.2-0ubuntu1+esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 1:14.0.4-0ubuntu1.1","noFixRecorded":false,"fixedIn":null},{"text":"< 1:18.0.0-0ubuntu1.1","noFixRecorded":false,"fixedIn":null},{"text":"< 1:22.0.0-0ubuntu2.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:2.1.0-0ubuntu1+esm1 | < 1:6.0.1-0ubuntu1.2+esm1 | < 1:10.0.2-0ubuntu1+esm1 | < 1:14.0.4-0ubuntu1.1 | < 1:18.0.0-0ubuntu1.1 | < 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