# CVE-2026-66781

## Summary

- **CVE ID:** CVE-2026-66781
- **Severity:** MEDIUM
- **CVSS Score:** 5.4 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L)
- **CWE:** CWE-312, CWE-749
- **Published:** Aug 18, 2026
- **Last Modified:** Sep 5, 2026

## Description

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 2.13 (1787365971)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.15 (1787362733)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.17 (1787362658)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.11 (1787689013)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.14 (1787362756)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.16 (1787362694)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.17 (1788105072)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.17 (1788073481)

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-66781)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2507526)
- [CNA](https://access.redhat.com/errata/RHSA-2026:60386)
- [CNA](https://access.redhat.com/errata/RHSA-2026:60389)
- [CNA](https://access.redhat.com/errata/RHSA-2026:60390)
- [CNA](https://access.redhat.com/errata/RHSA-2026:60387)
- [CNA](https://access.redhat.com/errata/RHSA-2026:60388)
- [CNA](https://access.redhat.com/errata/RHSA-2026:60391)
- [CNA](https://access.redhat.com/errata/RHSA-2026:63016)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 18.2

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