# 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.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 7 May 2026
- **Updated:** 8 May 2026
- **Also known as:** DEBIAN-CVE-2026-40214, GHSA-mmpc-xjxr-5hf8, PYSEC-2026-2854, UBUNTU-CVE-2026-40214

## 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 (Improper Ownership Management)

## Which versions are affected by CVE-2026-40214?

3 open source packages ship an affected version, including openstack-cyborg.


| Package | Ecosystem | 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.

## Is CVE-2026-40214 being exploited?

There is no known exploitation of CVE-2026-40214 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-40214 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-40214 in the wild and no public exploit code.

Affected packages and fixed versions:
- openstack-cyborg (PyPI): affected all versions; fixed in 16.0.1
- openstack-cyborg (PyPI): affected all versions; fixed in 16.0.1
- openstack-cyborg (PyPI): affected all versions; fixed in 16.0.1

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-40214/ (Markdown: https://insights.sbomify.com/CVE-2026-40214/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-40214
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40214
- OSV: https://osv.dev/vulnerability/CVE-2026-40214

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-40214/
Summaries are generated and may contain mistakes; the official description above is the record.