CVE-2026-71194 OpenStack CVE debrief

Who should care

Defenders managing OpenStack Designate configurations, particularly those with cross-tenant or cross-pool setups, should assess exposure and prioritize verification. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify versions, review DNS query and NOTIFY request handling, and implement compensating controls.

Why it matters

CVE-2026-71194 allows unauthenticated UDP packets to cause REFUSED responses in OpenStack Designate, impacting DNS services. Defenders should verify versions, assess exposure, and implement compensating controls.

• Potential disruption of DNS services via unauthenticated UDP packets
• Need for verification of affected OpenStack Designate versions
• Possible impact on cross-tenant and cross-pool configurations
• Requirement for compensating controls in affected environments

Technical summary

OpenStack Designate before 22.0.2 performs pool-blind lookups, causing REFUSED responses to DNS queries via unauthenticated UDP packets when zones with the same name exist across different pools. This issue affects cross-tenant and cross-pool configurations, potentially disrupting DNS services. The vulnerability can be exploited via a single unauthenticated UDP packet, and BIND9 views do not mitigate this issue as mDNS is a shared service upstream of any view configuration. Defenders should prioritize verifying affected OpenStack Designate versions and assessing exposure to unauthenticated UDP packets.

Defensive priority

Defenders should prioritize verifying affected OpenStack Designate versions and assessing exposure to unauthenticated UDP packets.

Recommended defensive actions

• Verify OpenStack Designate version and assess exposure to unauthenticated UDP packets
• Review DNS query and NOTIFY request handling
• Implement compensating controls for affected configurations
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability in OpenStack Designate, including its impact on DNS queries and NOTIFY requests. Evidence is limited to public CVE and NVD information. Defenders should verify OpenStack Designate versions, review DNS query and NOTIFY request handling, and assess exposure to unauthenticated UDP packets.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.