CVE-2026-40214 OpenStack Cyborg's Accelerator Request (ARQ) API does not enforce project ownership at any layer
Authenticated users can delete accelerator requests belonging to other projects due to missing ownership checks, causing cross-tenant denial of service.
- 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-2026-40214?
CVE-2026-40214 is a medium-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
In OpenStack Cyborg before 16.0.1, the Accelerator Request (ARQ) API does not enforce project ownership at any layer. The project_id column in the database is never populated (NULL for every ARQ), database queries have no project filtering, and policy checks are self-referential (the authorize_wsgi decorator compares the caller's project_id with itself rather than the target resource). Any authenticated non-admin user can complete various actions such as deleting ARQs bound to other projects' instances, aka cross-tenant denial of service.
Weakness: CWE-282
Which versions are affected by CVE-2026-40214?
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-2026-40214?
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-2026-40214 being exploited?
There is no known exploitation of CVE-2026-40214 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-40214, GHSA-mmpc-xjxr-5hf8, PYSEC-2026-2854, UBUNTU-CVE-2026-40214.