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CVE-2026-40213

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

7.4 HighFix available

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

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
Low

Exploit likelihood

0.21%Up 0.2 points since May 8, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.4

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

Record
CVE-2026-40213
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
Weakness
CWE-863
Updated
2026-11-02
EUVDEUVD-2026-28455 7.4

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

Record
EUVD-2026-28455
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-mm7j-mhhj-hj36 7.4

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

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

Record
GHSA-mm7j-mhhj-hj36
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
Weakness
CWE-863
Updated
2026-11-02
NVD 7.4

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

Record
CVE-2026-40213
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
Weakness
CWE-863
Updated
2026-11-02
OSVDEBIAN-CVE-2026-40213 7.4

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

Record
DEBIAN-CVE-2026-40213
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
Updated
2026-11-02
OSVGHSA-mm7j-mhhj-hj36 7.4

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

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

Record
GHSA-mm7j-mhhj-hj36
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
Weakness
CWE-863
Updated
2026-11-02
OSVPYSEC-2026-2853 7.4

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

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

Record
PYSEC-2026-2853
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2026-40213 7.4

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

Record
UBUNTU-CVE-2026-40213
CVSS 3.1
7.4 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
Updated
2026-11-02
OSVUSN-8413-1 No score

cyborg vulnerabilities

It was discovered that Cyborg did not properly enforce project ownership in the Accelerator Request (ARQ) API. An authenticated user could possibly use this issue to delete ARQs bound to other projects' instances, resulting in a cross-tenant denial of service. (CVE-2026-40214)

It was discovered that Cyborg used a permissive default policy that authorized any request carrying a valid authentication token, regardless of roles or scope, for multiple API endpoints. An authenticated user could possibly use this issue to perform unauthorized actions, such as reprogramming FPGA bitstreams on arbitrary compute nodes. (CVE-2026-40213)

Record
USN-8413-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
openstack-cyborg
PyPI
before 16.0.1
16.0.1
cyborg
Debian:13
before 14.0.0-3+deb13u1, plus listed versions
14.0.0-3
14.0.0-3+deb13u1
cyborg
Debian:14
before 16.0.0+git+2026.04.26.b8edfa06f1-1, plus listed versions
14.0.0-315.0.0-115.0.0~rc1-115.0.0~rc1-215.0.0~rc1-3
Show 5 moreShow less
16.0.0-116.0.0-216.0.0~rc1-116.0.0~rc1-216.0.0~rc2-1
16.0.0+git+2026.04.26.b8edfa06f1-1
openstack-cyborg
PyPI
before 16.0.1, plus listed versions
0.1.00.2.01.0.01.0.0.0b31.0.0.0rc1
Show 42 moreShow less
10.0.010.0.0.0rc110.1.011.0.011.0.0.0rc112.0.012.0.0.0rc113.0.013.0.0.0rc114.0.014.0.0.0rc114.1.015.0.015.0.0.0rc115.0.116.0.016.0.0.0rc116.0.0.0rc22.0.02.0.0.0rc13.0.03.0.0.0rc13.0.14.0.04.0.0.0rc14.0.15.0.05.0.0.0rc15.0.0.0rc25.0.16.0.06.0.0.0rc16.0.0.0rc26.0.17.0.07.0.0.0rc17.0.18.0.08.0.0.0rc18.0.19.0.09.0.0.0rc1
16.0.1
cyborg
Ubuntu:25.10
before 14.0.0-3+deb13u1build0.25.10.1, plus listed versions
13.0.0-214.0.0-214.0.0-3
14.0.0-3+deb13u1build0.25.10.1
cyborg
Ubuntu:26.04:LTS
before 16.0.0-2ubuntu0.1, plus listed versions
14.0.0-315.0.0-116.0.0~rc1-216.0.0-2
16.0.0-2ubuntu0.1
cyborg
Ubuntu:25.10
From an advisory covering 2 CVEs
before 14.0.0-3+deb13u1build0.25.10.1, plus listed versions
13.0.0-214.0.0-214.0.0-3
14.0.0-3+deb13u1build0.25.10.1
cyborg
Ubuntu:26.04:LTS
From an advisory covering 2 CVEs
before 16.0.0-2ubuntu0.1, plus listed versions
14.0.0-315.0.0-116.0.0~rc1-216.0.0-2
16.0.0-2ubuntu0.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-40213 is a high vulnerability (CVSS 7.4) in Openstack Cyborg, published May 7, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.21%, the 10th percentile. Fixed in openstack-cyborg 16.0.1.

References

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