CVE-2026-4740
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Go | open-cluster-management.io/ocm | <1.2.1 | 1.2.1 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| redhat | advanced_cluster_management_for_kubernetes | - | |
References
- https://access.redhat.com/security/cve/CVE-2026-4740
- https://blog.arfevrier.fr/open-cluster-management-cross-cluster-escape/
- https://bugzilla.redhat.com/show_bug.cgi?id=2450590
- https://nvd.nist.gov/vuln/detail/CVE-2026-4740
- https://github.com/open-cluster-management-io/ocm/commit/9e70cc1e21a15239c81111062c0b37df4b5a8026
- https://blog.arfevrier.fr/open-cluster-management-cross-cluster-escape
- https://github.com/open-cluster-management-io/OCM
CWEs
CWE-295
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.