OpenStack Cyborg uses rule:allow (check_str='@') as the default policy for multiple API endpoints

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.4 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L

EPSS

• CVE-2026-40213: 0.21% estimated exploitation activity in the next 30 days; percentile 10.73 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

OpenStack Cyborg before 16.0.1 uses rule:allow (checkstr='@') 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.

Published by the source

8 May 2026, 00:31 UTC

Last modified by the source

13 Jul 2026, 16:42 UTC

Source last checked

26 Oct 2026, 13:41 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-mm7j-mhhj-hj36

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-mm7j-mhhj-hj36

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# Patch Next advisory brief: CVE-2026-40213

Advisory: OpenStack Cyborg uses rule:allow (check_str='@') as the default policy for multiple API endpoints
IDs: CVE-2026-40213, GHSA-mm7j-mhhj-hj36
Record: https://patchnext.com/advisories/cve-2026-40213 (revision 2, source checked 26 Oct 2026, 13:41 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: openstack-cyborg 16.0.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI openstack-cyborg: affected < 16.0.1; fixed in 16.0.1

## Suggested inspection (read-only)
- `python -m pip show openstack-cyborg`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on openstack-cyborg.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-mm7j-mhhj-hj36 (OSV record GHSA-mm7j-mhhj-hj36 lists affected ranges: PyPI openstack-cyborg >=0 <16.0.1 (fixed))
- Verified: https://github.com/advisories/GHSA-mm7j-mhhj-hj36 (GitHub-reviewed advisory GHSA-mm7j-mhhj-hj36 lists affected ranges: PyPI openstack-cyborg >=0 <16.0.1)

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