CVE-2026-40213 OpenStack CVE debrief

Who should care

OpenStack administrators, cloud operators, and security teams responsible for OpenStack deployments should assess exposure and prioritize remediation. These stakeholders should review the vulnerability details, assess the potential impact on their environments, and plan for remediation. Security teams should also monitor for suspicious activity and review compensating controls for exposed systems.

Why it matters

CVE-2026-40213 is a high-severity vulnerability in OpenStack Cyborg that allows any authenticated user to perform sensitive actions, regardless of roles or project membership. Defenders should prioritize verification and remediation, especially in environments with diverse or untrusted user populations.

• Unrestricted access to sensitive actions on compute nodes
• Potential for unauthorized FPGA bitstream reprogramming
• Bypass of role-based access control for API endpoints
• Increased risk of lateral movement in OpenStack environments

Technical summary

The OpenStack Cyborg project uses a default policy that allows any authenticated user to perform actions on API endpoints, including reprogramming FPGA bitstreams on compute nodes. This policy bypass vulnerability allows users with zero role assignments to complete sensitive actions. The vulnerability has a high CVSS score of 7.4, indicating a significant security risk. Defenders should prioritize verifying and remediating this vulnerability in OpenStack Cyborg deployments, especially in environments with untrusted or diverse user populations.

Defensive priority

Defenders should prioritize verifying and remediating this vulnerability in OpenStack Cyborg deployments, especially in environments with untrusted or diverse user populations.

Recommended defensive actions

• Verify OpenStack Cyborg version and apply patch 16.0.1 or later
• Review and restrict default policy rules for API endpoints
• Monitor for suspicious activity on compute nodes and FPGA bitstreams
• Review compensating controls for exposed systems while remediation is scheduled and verified
• 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
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and references to OpenStack security advisories and bug reports. The OpenStack security advisory (OSSA-2026-011) and Launchpad bug report offer additional context on the vulnerability and its impact. Defenders should verify the affected scope and severity using these sources. Evidence is limited to public sources, and defenders should be aware of potential unknown affected scope.

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.