CVE-2026-42998
Fixed in a distro release EPSS <1%CVSS 6.0
An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone application credential authentication plugin does not verify that the user supplied in the authentication request matches the owner of the application credential. An attacker can authenticate with their own application credential ID and secret while specifying a different user's name and domain in the request body. Keystone issues a token attributed to the victim user. The impersonated token is project-scoped and carries the intersection of the application credential's roles and the victim's actual roles on the project. This enables audit evasion, reading the victim's credentials, and acting as the victim within shared projects.
Products: OpenStack Keystone
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| PyPI | keystone | 27.0.2 |
| PyPI | keystone | 28.0.2 |
| PyPI | keystone | 29.0.2 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | openstack-keystone-2025.1 | 27.0.1_git20260618-r6 |
| Chainguard | openstack-keystone-2025.1-fips | 27.0.1_git20260618-r7 |
| Chainguard | openstack-keystone-2025.2 | 28.0.1_git20260618-r5 |
| Chainguard | openstack-keystone-2025.2-fips | 28.0.1_git20260618-r5 |
| Chainguard | openstack-keystone-2026.1 | 29.0.1_git20260616-r6 |
| Chainguard | openstack-keystone-2026.1-fips | 29.0.1_git20260617-r6 |
| Debian 12 | keystone | 2:22.0.2-0+deb12u3 |
| Debian 13 | keystone | 2:27.0.0-3+deb13u4 |
| Debian 14 | keystone | 2:29.0.1-2 |
| Ubuntu 22.04 LTS | keystone | 2:21.0.1-0ubuntu2.4 |
| Ubuntu 24.04 LTS | keystone | 2:25.0.0-0ubuntu1.4 |
| Ubuntu 25.10 | keystone | 2:28.0.0-0ubuntu1.3 |
| Ubuntu 26.04 LTS | keystone | 2:29.0.0-0ubuntu1.2 |
| Ubuntu Pro 16.04 LTS | keystone | no fix |
| Ubuntu Pro 18.04 LTS | keystone | no fix |
| Ubuntu Pro 20.04 LTS | keystone | no fix |