redhat acm CVE-2026-66785 is a vulnerability in Red Hat Acm
Published on August 20, 2026

Submariner: submariner: unvalidated endpoint.spec.subnets propagated into wireguard allowedips / ipsec enables traffic hijack
A flaw was found in Submariner. This vulnerability allows a malicious cluster (spoke) to redirect network traffic from other connected clusters (peer clusters) by publishing a specially crafted network endpoint. The system fails to properly validate the network subnets provided by the malicious cluster, enabling it to declare arbitrary network ranges. Consequently, all network traffic intended for these arbitrary ranges from peer clusters will be rerouted through the attacker's tunnel, potentially leading to unauthorized information disclosure or network disruption.

NVD

Vulnerability Analysis

CVE-2026-66785 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
CHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Timeline

Reported to Red Hat.

Made public. 24 days later.

Weakness Type

Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.


Products Associated with CVE-2026-66785

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Red Hat Acm
 

Affected Versions

Red Hat Advanced Cluster Management for Kubernetes 2: Red Hat Advanced Cluster Management for Kubernetes 2: Red Hat Advanced Cluster Management for Kubernetes 2: Red Hat Advanced Cluster Management for Kubernetes 2: Red Hat Advanced Cluster Management for Kubernetes 2: Red Hat Advanced Cluster Management for Kubernetes 2: Red Hat Advanced Cluster Management for Kubernetes 2: Red Hat Advanced Cluster Management for Kubernetes 2: Red Hat Advanced Cluster Management for Kubernetes 2: