# CVE-2026-66785

## Summary

- **CVE ID:** CVE-2026-66785
- **Severity:** LOW
- **CVSS Score:** 2.5 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N)
- **CWE:** CWE-20, CWE-732
- **Published:** Aug 20, 2026
- **Last Modified:** Sep 3, 2026

## Description

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.

## Affected Products

- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.17 (1788023916)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.17 (1788023940)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.17 (1788105072)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.17 (1788043964)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.17 (1788043961)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.17 (1788073481)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.17 (1788043970)

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-66785)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2507530)
- [CNA](https://access.redhat.com/errata/RHSA-2026:63016)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.10%
- **EPSS Percentile:** 0.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._