CVE-2026-42999
Description
An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone RBAC policy enforcer in enforce_call unconditionally merges the raw JSON request body into the policy enforcement dictionary via policy_dict.update(json_input.copy()), overwriting trusted target data that was previously set from database lookups. Because flask.request.get_json is called with force=True, this works regardless of Content-Type or HTTP method. Any authenticated user can inject arbitrary policy target attributes (e.g., user_id, project_id) into the request body to bypass RBAC checks and perform unauthorized operations on resources belonging to other users or projects. This was introduced in commit 5ea59f52 (Rocky/14.0.0).
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| OpenStack | Keystone | 14.0.0 – < 27.0.2, 28.0.0 – < 28.0.2, 29.0.0 – < 29.0.2 | |
| Red Hat | Red Hat OpenStack Platform 13 (Queens) | all versions | |
| Red Hat | Red Hat OpenStack Platform 16.2 | all versions | |
| Red Hat | Red Hat OpenStack Platform 17.1 | all versions | |
| Red Hat | Red Hat OpenStack Platform 18.0 | all versions |
References and patches
- https://bugs.launchpad.net/keystone/+bug/2148398 ExploitIssue TrackingPatchThird Party Advisory
- https://security.openstack.org/ossa/OSSA-2026-015.html PatchVendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-42999
- https://bugzilla.redhat.com/show_bug.cgi?id=2482840
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42999.json
CPE matches (NVD) (3)
cpe:2.3:a:openstack:keystone:*:*:*:*:*:*:*:*≥ 14.0.0 < 27.0.2cpe:2.3:a:openstack:keystone:*:*:*:*:*:*:*:*≥ 28.0.0 < 28.0.2cpe:2.3:a:openstack:keystone:*:*:*:*:*:*:*:*≥ 29.0.0 < 29.0.2