CVE-2026-40213 OpenStack Cyborg uses rule:allow (check_str='@') as the default policy for multiple API endpoints
An authenticated user with no roles can bypass authorization checks to reprogram FPGA bitstreams on arbitrary compute nodes in OpenStack Cyborg.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-40213?
CVE-2026-40213 is a high-severity missing authorization vulnerability in OpenStack Cyborg, published on 7 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
OpenStack Cyborg before 16.0.1 uses rule:allow (check_str='@') as the default policy for multiple API endpoints. This unconditionally authorizes any request carrying a valid Keystone token regardless of roles, project membership, or scope. An authenticated user with zero role assignments can complete various actions such as reprogramming FPGA bitstreams on arbitrary compute nodes via agent RPC.
Weakness: CWE-863
Which versions are affected by CVE-2026-40213?
3 open source packages ship an affected version, including openstack-cyborg.
| Package | Affected | Fixed in |
|---|---|---|
openstack-cyborg PyPI | All versions | 16.0.1 |
openstack-cyborg PyPI | All versions | 16.0.1 |
openstack-cyborg PyPI | All versions | 16.0.1 |
How do I fix CVE-2026-40213?
Upgrade openstack-cyborg to 16.0.1 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-40213 being exploited?
There is no known exploitation of CVE-2026-40213 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-40213, GHSA-mm7j-mhhj-hj36, PYSEC-2026-2853, UBUNTU-CVE-2026-40213.