GHSA-q4gv-pjmh-c735
Open Cluster Management (OCM): Cross-cluster privilege escalation via improper Kubernetes client certificate renewal validation
At a glance
- Published
- Updated
- CVE
- CVE-2026-4740
- Aliases
- GO-2026-5564
- CVSS_V3
- CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Description
A flaw was found in Open Cluster Management (OCM), the technology underlying Red Hat Advanced Cluster Management (ACM). Improper validation of Kubernetes client certificate renewal allows a managed cluster administrator to forge a client certificate that can be approved by the OCM controller. This enables cross-cluster privilege escalation and may allow an attacker to gain control over other managed clusters, including the hub cluster.
Affected packages
| Package | Versions |
|---|---|
| Go · open-cluster-management.io/ocm | introduced 0, fixed 1.2.1 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-4740 ADVISORY
- https://github.com/open-cluster-management-io/ocm/commit/9e70cc1e21a15239c81111062c0b37df4b5a8026 WEB
- https://access.redhat.com/security/cve/CVE-2026-4740 WEB
- https://blog.arfevrier.fr/open-cluster-management-cross-cluster-escape WEB
- https://bugzilla.redhat.com/show_bug.cgi?id=2450590 WEB
- https://github.com/open-cluster-management-io/OCM PACKAGE
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |