Critical [CVE-2026-73268] spec.install.overrideJob allows arbitrary Job spec injection
This critical-severity Red Hat Linux advisory covers CVE-2026-73268 affecting Multicluster Engine for Kubernetes.
Android app · Google Play
Monitor future Red Hat Linux CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.
Summary
A flaw was found in the cluster-curator-controller component of multicluster engine (MCE). A tenant with create or update permissions on ClusterCurator resources can inject an arbitrary Job specification.
This is possible because the CreateJob() function does not validate user-controlled input when unmarshaling the spec.install.overrideJob raw extension. Successful exploitation allows the injected Job to run with the controller's elevated privileges, leading to arbitrary code execution and privilege escalation, potentially accessing cluster-wide secrets.
The vulnerability stems from insufficient validation of the `spec.install.overrideJob` field, enabling injection of malicious Job specifications that run with the controller's highly privileged ServiceAccount, potentially exposing cluster-wide secrets and managed cluster access.
Red Hat severity: Important — CVSS 9.9 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H). Weakness: CWE-94.
Affected Red Hat products: Multicluster Engine for Kubernetes. Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- To mitigate this issue, implement strict Role-Based Access Control (RBAC) policies to limit create and update permissions on `clustercurators.cluster.open-cluster-management.io` resources to trusted administrators only. This restricts the ability of less privileged tenants to exploit the vulnerability and escalate privileges within the Kubernetes environment.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.