CVE-2026-42999
An issue was discovered in OpenStack Keystone before 29.0.2.
Impact
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).
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | keystone | >= 14.0.0, < 27.0.2 | 27.0.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Openstack | Keystone | from 14.0.0 before 27.0.2 from 28.0.0 before 28.0.2 from 29.0.0 before 29.0.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-2r23-2g6v-2m5f
- https://nvd.nist.gov/vuln/detail/CVE-2026-42999
- https://bugs.launchpad.net/keystone/+bug/2148398
- https://security.openstack.org/ossa/OSSA-2026-015.html
- 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
- https://github.com/pypa/advisory-database/tree/main/vulns/keystone/PYSEC-2026-600.yaml