DEBIAN-CVE-2026-43000

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Source
https://security-tracker.debian.org/tracker/CVE-2026-43000
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43000.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-43000
Upstream
Published
2026-05-28T19:16:37Z
Modified
2026-09-01T16:06:42Z
Severity
  • 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
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

Debian:12 / keystone

Package

Name
keystone
Purl
pkg:deb/debian/keystone?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:22.0.2-0+deb12u3

Affected versions

2:22.*
2:22.0.0-2
2:22.0.2-0+deb12u1
2:22.0.2-0+deb12u2

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43000.json"

Debian:13 / keystone

Package

Name
keystone
Purl
pkg:deb/debian/keystone?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:27.0.0-3+deb13u4

Affected versions

2:27.*
2:27.0.0-3
2:27.0.0-3+deb13u1
2:27.0.0-3+deb13u3

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43000.json"

Debian:14 / keystone

Package

Name
keystone
Purl
pkg:deb/debian/keystone?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:29.0.1-2

Affected versions

2:27.*
2:27.0.0-3
2:28.*
2:28.0.0~rc1-1
2:28.0.0~rc1-2
2:28.0.0~rc1-4
2:28.0.0-1
2:28.0.0-2
2:28.0.0-3
2:28.0.0-4
2:28.0.0-5
2:28.0.0-6
2:29.*
2:29.0.0~rc1-1
2:29.0.0~rc1-2
2:29.0.0-1
2:29.0.0-2
2:29.0.0-3
2:29.0.1-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43000.json"