# CVE-2026-43000: keystone: An issue was discovered in OpenStack Keystone before 29.0.2

CVE-2026-43000 is fixed in 3 products on 1 platform, first by keystone 2:29.0.0-0ubuntu1.2, released May 28, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-43000
- Priority: High
- CVSS: 8.8 (high)
- EPSS: 0.0033
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 28, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | keystone Debian 12.15 (bookworm) | 2:22.0.2-0+deb12u3 | [DEBIAN-CVE-2026-43000](https://patchblox.com/security/data/fix/linux/debian-cve-2026-43000.md) | Jun 24, 2026 |
| Linux | keystone Debian 13.5 (trixie) | 2:27.0.0-3+deb13u4 | [DEBIAN-CVE-2026-43000](https://patchblox.com/security/data/fix/linux/debian-cve-2026-43000.md) | Jun 24, 2026 |
| Linux | keystone Debian 14 | 2:29.0.1-2 | [DEBIAN-CVE-2026-43000](https://patchblox.com/security/data/fix/linux/debian-cve-2026-43000.md) | Jun 24, 2026 |
| Linux | keystone Ubuntu 22.04.1 LTS (jammy) | 2:21.0.1-0ubuntu2.4 | [keystone 2:21.0.1-0ubuntu2.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-keystone-2-21.0.1-0ubuntu2.4.md) | Jun 24, 2026 |
| Linux | keystone Ubuntu 24.04.5 LTS (noble) | 2:25.0.0-0ubuntu1.4 | [keystone 2:25.0.0-0ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-keystone-2-25.0.0-0ubuntu1.4.md) | Jun 24, 2026 |
| Linux | keystone Ubuntu 25.10 (questing) | 2:28.0.0-0ubuntu1.3 | [keystone 2:28.0.0-0ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-keystone-2-28.0.0-0ubuntu1.3.md) | Jun 24, 2026 |
| Linux | keystone Ubuntu 26.04.1 LTS (resolute) | 2:29.0.0-0ubuntu1.2 | [keystone 2:29.0.0-0ubuntu1.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-keystone-2-29.0.0-0ubuntu1.2.md) | May 28, 2026 |
| Linux | keystone-common Ubuntu 22.04.1 LTS (jammy) | 2:21.0.1-0ubuntu2.4 | [keystone-common 2:21.0.1-0ubuntu2.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-keystone-common-2-21.0.1-0ubuntu2.4.md) | Jun 24, 2026 |
| Linux | keystone-common Ubuntu 24.04.5 LTS (noble) | 2:25.0.0-0ubuntu1.4 | [keystone-common 2:25.0.0-0ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-keystone-common-2-25.0.0-0ubuntu1.4.md) | Jun 24, 2026 |
| Linux | keystone-common Ubuntu 25.10 (questing) | 2:28.0.0-0ubuntu1.3 | [keystone-common 2:28.0.0-0ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-keystone-common-2-28.0.0-0ubuntu1.3.md) | Jun 24, 2026 |
| Linux | keystone-common Ubuntu 26.04.1 LTS (resolute) | 2:29.0.0-0ubuntu1.2 | [keystone-common 2:29.0.0-0ubuntu1.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-keystone-common-2-29.0.0-0ubuntu1.2.md) | May 28, 2026 |
| Linux | python3-keystone Ubuntu 22.04.1 LTS (jammy) | 2:21.0.1-0ubuntu2.4 | [python3-keystone 2:21.0.1-0ubuntu2.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python3-keystone-2-21.0.1-0ubuntu2.4.md) | Jun 24, 2026 |
| Linux | python3-keystone Ubuntu 24.04.5 LTS (noble) | 2:25.0.0-0ubuntu1.4 | [python3-keystone 2:25.0.0-0ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-python3-keystone-2-25.0.0-0ubuntu1.4.md) | Jun 24, 2026 |
| Linux | python3-keystone Ubuntu 25.10 (questing) | 2:28.0.0-0ubuntu1.3 | [python3-keystone 2:28.0.0-0ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-questing-python3-keystone-2-28.0.0-0ubuntu1.3.md) | Jun 24, 2026 |
| Linux | python3-keystone Ubuntu 26.04.1 LTS (resolute) | 2:29.0.0-0ubuntu1.2 | [python3-keystone 2:29.0.0-0ubuntu1.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-python3-keystone-2-29.0.0-0ubuntu1.2.md) | May 28, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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