UBUNTU-CVE-2026-43000

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-43000
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43000.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-43000
Upstream
  • CVE-2026-43000
Downstream
Related
Published
2026-05-28T19:16:00Z
Modified
2026-06-17T02:05:22.723709220Z
Severity
  • 6.0 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L CVSS Calculator
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

An issue was discovered in OpenStack Keystone before 29.0.2. When combined with an application credential impersonation vulnerability, an attacker with the member role on a project can escalate to admin by chaining unrestricted application credentials with Keystone trusts. The impersonated token carries the victim's identity, which passes the trustor validation check. Keystone then validates the delegated roles against the victim's actual role assignments in the database, not the roles on the requesting token. This allows the attacker to create a trust delegating the victim's admin role to themselves. The trust persists independently, and additional trusts and application credentials can be created to maintain access. All actions are logged under the victim's identity.

References

Affected packages

Ubuntu:16.04:LTS
keystone

Package

Name
keystone
Purl
pkg:deb/ubuntu/keystone?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2:8.*
2:8.0.0-0ubuntu1
2:9.*
2:9.0.0~b1-0ubuntu1
2:9.0.0~b2-0ubuntu1
2:9.0.0~b3-0ubuntu1
2:9.0.0~rc1-0ubuntu1
2:9.0.0-0ubuntu1
2:9.0.2-0ubuntu1
2:9.0.2-0ubuntu2
2:9.1.0-0ubuntu1
2:9.2.0-0ubuntu1
2:9.3.0-0ubuntu1
2:9.3.0-0ubuntu2
2:9.3.0-0ubuntu3
2:9.3.0-0ubuntu3.1
2:9.3.0-0ubuntu3.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2:9.3.0-0ubuntu3.2",
            "binary_name": "keystone"
        },
        {
            "binary_version": "2:9.3.0-0ubuntu3.2",
            "binary_name": "python-keystone"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43000.json"
Ubuntu:18.04:LTS
keystone

Package

Name
keystone
Purl
pkg:deb/ubuntu/keystone?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2:12.*
2:12.0.0-0ubuntu1
2:13.*
2:13.0.0~b1-0ubuntu1
2:13.0.0~b2-0ubuntu1
2:13.0.0~b3-0ubuntu1
2:13.0.0~rc1-0ubuntu1
2:13.0.0~rc2-0ubuntu1
2:13.0.0-0ubuntu1
2:13.0.1-0ubuntu1
2:13.0.2-0ubuntu1
2:13.0.2-0ubuntu3
2:13.0.4-0ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2:13.0.4-0ubuntu1",
            "binary_name": "keystone"
        },
        {
            "binary_version": "2:13.0.4-0ubuntu1",
            "binary_name": "python-keystone"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43000.json"
Ubuntu:22.04:LTS
keystone

Package

Name
keystone
Purl
pkg:deb/ubuntu/keystone?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2:21.0.1-0ubuntu2.4

Affected versions

2:20.*
2:20.0.0-0ubuntu1
2:20.0.0+git2021120815.2ddf8f321-0ubuntu1
2:20.0.0+git2022011217.771c943ad-0ubuntu1
2:20.0.0+git2022030313.a3fc9e7c3-0ubuntu1
2:21.*
2:21.0.0-0ubuntu1
2:21.0.1-0ubuntu1
2:21.0.1-0ubuntu2
2:21.0.1-0ubuntu2.1
2:21.0.1-0ubuntu2.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "2:21.0.1-0ubuntu2.4",
            "binary_name": "keystone"
        },
        {
            "binary_version": "2:21.0.1-0ubuntu2.4",
            "binary_name": "keystone-common"
        },
        {
            "binary_version": "2:21.0.1-0ubuntu2.4",
            "binary_name": "python3-keystone"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43000.json"
Ubuntu:24.04:LTS
keystone

Package

Name
keystone
Purl
pkg:deb/ubuntu/keystone?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2:25.0.0-0ubuntu1.4

Affected versions

2:24.*
2:24.0.0-0ubuntu1
2:24.0.0+git2024011916.adfa92b4-0ubuntu1
2:25.*
2:25.0.0~rc1-0ubuntu1
2:25.0.0-0ubuntu1
2:25.0.0-0ubuntu1.1
2:25.0.0-0ubuntu1.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2:25.0.0-0ubuntu1.4",
            "binary_name": "keystone"
        },
        {
            "binary_version": "2:25.0.0-0ubuntu1.4",
            "binary_name": "keystone-common"
        },
        {
            "binary_version": "2:25.0.0-0ubuntu1.4",
            "binary_name": "python3-keystone"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43000.json"
Ubuntu:25.10
keystone

Package

Name
keystone
Purl
pkg:deb/ubuntu/keystone?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2:28.0.0-0ubuntu1.3

Affected versions

2:27.*
2:27.0.0-0ubuntu1
2:27.0.0+git2025080113.e066e18ab-0ubuntu1
2:28.*
2:28.0.0~rc1-0ubuntu1
2:28.0.0-0ubuntu1
2:28.0.0-0ubuntu1.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2:28.0.0-0ubuntu1.3",
            "binary_name": "keystone"
        },
        {
            "binary_version": "2:28.0.0-0ubuntu1.3",
            "binary_name": "keystone-common"
        },
        {
            "binary_version": "2:28.0.0-0ubuntu1.3",
            "binary_name": "python3-keystone"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43000.json"
Ubuntu:26.04:LTS
keystone

Package

Name
keystone
Purl
pkg:deb/ubuntu/keystone?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2:29.0.0-0ubuntu1.2

Affected versions

2:28.*
2:28.0.0-0ubuntu1
2:28.0.0-0ubuntu2
2:28.0.0+git20260119.61.8a42793e7-0ubuntu1
2:29.*
2:29.0.0~rc1-0ubuntu1
2:29.0.0-0ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2:29.0.0-0ubuntu1.2",
            "binary_name": "keystone"
        },
        {
            "binary_version": "2:29.0.0-0ubuntu1.2",
            "binary_name": "keystone-common"
        },
        {
            "binary_version": "2:29.0.0-0ubuntu1.2",
            "binary_name": "python3-keystone"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43000.json"
Ubuntu:Pro:20.04:LTS
keystone

Package

Name
keystone
Purl
pkg:deb/ubuntu/keystone?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2:16.*
2:16.0.0-0ubuntu1
2:17.*
2:17.0.0~b1~git2019121613.db81fee63-0ubuntu1
2:17.0.0~b2~git2020020513.99733f172-0ubuntu1
2:17.0.0~b3~git2020032415.9f9040257-0ubuntu1
2:17.0.0~b3~git2020032415.9f9040257-0ubuntu2
2:17.0.0~b3~git2020041013.7bb6314e4-0ubuntu1
2:17.0.0-0ubuntu0.20.04.1
2:17.0.1-0ubuntu1
2:17.0.1-0ubuntu2
2:17.0.1-0ubuntu2+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2:17.0.1-0ubuntu2+esm1",
            "binary_name": "keystone"
        },
        {
            "binary_version": "2:17.0.1-0ubuntu2+esm1",
            "binary_name": "keystone-common"
        },
        {
            "binary_version": "2:17.0.1-0ubuntu2+esm1",
            "binary_name": "python3-keystone"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-43000.json"