CVE-2026-66781: Red Hat Advanced Cluster Management For Kubernetes 2

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

A flaw was found in the Submariner operator. The Submariner Custom Resource (CR), used for configuring network connectivity, stores the IPsec pre-shared key (PSK) in an unencrypted format. This key, which is critical for securing communication between Kubernetes clusters, can be accessed by unauthorized parties. Such access enables an attacker to passively decrypt network traffic flowing between any two clusters in the mesh, resulting in sensitive information disclosure.

Affected products

Red Hat Red Hat Advanced Cluster Management For Kubernetes 2
Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.11: before 1787689013 (fixed in 1787689013)
Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.13: before 1787365971 (fixed in 1787365971)
Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.14: before 1787362756 (fixed in 1787362756)
Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.15: before 1787362733 (fixed in 1787362733)
Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.16: before 1787362694 (fixed in 1787362694)
Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.17: before 1787362658 (fixed in 1787362658); before 1788105072 (fixed in 1788105072); before 1788073481 (fixed in 1788073481)

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