CVE-2026-66781: Exposed Dangerous Method or Function in Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.11
Description
A vulnerability in Red Hat Advanced Cluster Management for Kubernetes 2.11 involves the Submariner operator storing the IPsec pre-shared key (PSK) in an unencrypted format within the Submariner Custom Resource. This exposure allows unauthorized parties to access the PSK and passively decrypt network traffic between Kubernetes clusters, leading to potential sensitive information disclosure. The vulnerability has a CVSS score of 5.4, indicating medium severity. Red Hat has issued security advisories and updates for newer versions, but no fix is currently available for version 2.11.11. Users are advised to apply all relevant errata and updates as they become available.
CVSS v3.1
Score 5.4medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-66781 is a medium severity vulnerability affecting Red Hat Advanced Cluster Management for Kubernetes 2.11. The Submariner operator stores the IPsec pre-shared key (PSK) unencrypted in the Submariner Custom Resource, which is used to configure network connectivity between Kubernetes clusters. This flaw allows unauthorized access to the PSK, enabling passive decryption of network traffic between clusters in the mesh. The vulnerability is identified by CWE-312 (Cleartext Storage of Sensitive Information) and CWE-749 (Exposed Dangerous Method or Function). Red Hat has released security advisories (RHSA-2026:60386 and RHSA-2026:60387) addressing this and other vulnerabilities in later versions, but no direct fix is provided for version 2.11.11. The advisories recommend applying all previously released errata and updates. The vulnerability does not affect cloud-hosted services and no known exploits are reported in the wild.
Potential Impact
Unauthorized parties can access the IPsec pre-shared key stored unencrypted in the Submariner Custom Resource, allowing them to passively decrypt network traffic between Kubernetes clusters managed by Red Hat Advanced Cluster Management for Kubernetes 2.11. This results in sensitive information disclosure but does not allow modification or disruption of traffic. The CVSS 3.1 base score is 5.4 (medium severity), reflecting local network attack vector with low complexity and no privileges required.
Mitigation Recommendations
Red Hat has rated this vulnerability as important and has released updated container images and security advisories for newer versions of Red Hat Advanced Cluster Management for Kubernetes (e.g., v2.17.1). For version 2.11.11, no direct fix is currently available. Users should ensure that all previously released errata relevant to their system are applied. It is recommended to upgrade to a fixed version once available and monitor Red Hat advisories for updates. No additional vendor-recommended mitigations are specified in the advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-gcch-g8g2-6852
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-66781"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
- State
- PUBLISHED
Patch Information
Threat ID: 6a905402acd9273b49697070
Added to database: 08/27/2026, 15:13:06 UTC
Last enriched: 09/10/2026, 06:39:22 UTC
Last updated: 10/10/2026, 06:48:18 UTC
Views: 58
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