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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenStack | Cyborg | 3.0.0 – < 14.0.1, 15.0.0 – < 15.0.1, 16.0.0 – < 16.0.1 | 14.0.1 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | cyborg | 16.0.0+git+2026.04.26.b8edfa06f1-1 | — |
| Debian 13 | cyborg | 14.0.0-3+deb13u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | cyborg | 16.0.0-2ubuntu0.1 | USN-8413-1 |
| Ubuntu 25.10 | cyborg | 14.0.0-3+deb13u1build0.25.10.1 | USN-8413-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | openstack-cyborg | < 16.0.1 | 16.0.1 | GHSA-mmpc-xjxr-5hf8 |
Advisories 1
- USN-8413-1 cyborg vulnerabilities Ubuntu Security Notices (USN) · Jun 9, 2026