RCE in Red Hat Advanced Cluster Management For Kubernetes 2
CVE-2026-66786
A flaw was found in submariner. In cert-auth mode, the connection configuration is built using free-form strings from the Custom Resource Definition (CRD) without proper validation. A malicious cluster can exploit this by publishing a CableName that includes newlines and ipsec.conf directives. This allows an attacker to inject arbitrary configuration parameters or execute commands through leftupdown hooks, leading to remote code execution as root on the gateway node.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.014 (71.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.014 · change: +0.006
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-66786 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- access.redhat.com/errata/RHSA-2026:63016 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-66786?
- CVE-2026-66786 is a critical-severity vulnerability in Red Hat Advanced Cluster Management For Kubernetes 2, classified under Code Injection. CVSS score: 9.1/10. Published 2026-09-02.
- How severe is CVE-2026-66786?
- Critical severity. CVSS v3 base score is 9.1 out of 10.