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CVE-2026-40214

27
FAUCET Score

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.

First published: May 7, 2026Last modified: May 8, 2026

Impacted Technologies

VendorProductVersion(s)CPE
OpenStackCyborg
>= 3.0.0, < 14.0.1, >= 15.0.0, < 15.0.1, >= 16.0.0, < 16.0.1CNA affecteddefault unaffected

CVSS Data

CVSS version used by this source: 3.1

6.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.8
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.21%
Probability of exploitation in next 30 days
EPSS Percentile
10.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0021 is in the 9th percentile among its peer group of 21,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

pippatch availablevia ghsa
Product: openstack-cyborgFixed in: 16.0.1
ubuntupatch availablevia ubuntu_usn
Product: cyborg (questing)Fixed in: 14.0.0-3+deb13u1build0.25.10.1
ubuntupatch availablevia ubuntu_usn
Product: cyborg (resolute)Fixed in: 16.0.0-2ubuntu0.1

Vendor Advisories (2)

ubuntuUSN-8413-1

Cyborg vulnerabilities

Jun 9, 2026
pipGHSA-mmpc-xjxr-5hf8medium

OpenStack Cyborg's Accelerator Request (ARQ) API does not enforce project ownership at any layer

May 8, 2026

References

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