CVE-2026-66783: Red Hat Advanced Cluster Management For Kubernetes 2

Medium severity, CVSS 4.4. EPSS: 0.4% chance of exploitation in the next 30 days.

A flaw was found in the `submariner-operator` component of Red Hat Advanced Cluster Management for Kubernetes. This vulnerability allows a cluster administrator, or any user with permissions to modify the Submariner Custom Resource (CR), to specify an unvalidated image path. This lack of validation enables an attacker to execute arbitrary code with elevated privileges across the entire cluster, including control-plane nodes, by deploying a malicious image.

Affected products

• Red Hat Red Hat Advanced Cluster Management For Kubernetes 2
• Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.17: before 1788105072 (fixed in 1788105072); before 1788073481 (fixed in 1788073481)

Published 2026-08-18. Last modified 2026-09-03.