Vulnerability in Red Hat Advanced Cluster Management For Kubernetes 2
CVE-2026-66781
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L.
EPSS exploit prediction
EPSS: 0.004 (30.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-66781 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- access.redhat.com/errata/RHSA-2026:60386 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:60389 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:60390 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:60387 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:60388 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:60391 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:63016 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-66781?
- CVE-2026-66781 is a medium-severity vulnerability in Red Hat Advanced Cluster Management For Kubernetes 2, classified under CWE-749. CVSS score: 5.4/10. Published 2026-08-18.
- How severe is CVE-2026-66781?
- Medium severity. CVSS v3 base score is 5.4 out of 10.