CVE-2026-40683
Fixed in a distro release EPSS <1%CVSS 7.7
In OpenStack Keystone before 28.0.1, the LDAP identity backend does not convert the user enabled attribute to a boolean when the user_enabled_invert configuration option is False (the default). The _ldap_res_to_model method in the UserApi class only performed string-to-boolean conversion when user_enabled_invert was True. When False, the raw string value from LDAP (e.g., "FALSE") was used directly. Since non-empty strings are truthy in Python, users marked as disabled in LDAP were treated as enabled by Keystone, allowing them to authenticate and perform actions. All deployments using the LDAP identity backend without user_enabled_invert=True or user_enabled_emulation are affected.
Products: OpenStack Keystone
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| PyPI | keystone | 28.0.1 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | openstack-keystone-2025.1 | 0 |
| Chainguard | openstack-keystone-2025.1-fips | 0 |
| Debian 12 | keystone | 2:22.0.2-0+deb12u2 |
| Debian 13 | keystone | 2:27.0.0-3+deb13u3 |
| Debian 14 | keystone | 2:29.0.0~rc1-2 |
| Red Hat openstack 18.0 | openstack-keystone | 1:23.0.3-18.0.20260610133808.9e3dfb4.el9ost |
| Red Hat openstack 18.0 | python3-keystone | 1:23.0.3-18.0.20260610133808.9e3dfb4.el9ost |
| 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 |