CVE-2026-66785: Submariner: missing validation of remote endpoint subnets and clusterid enables cross-cluster traffic hijack
Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.16
Vendor fix available · Affected: Red Hat Advanced Cluster Management for Kubernetes 2.16 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 10% of scored CVEs
DescriptionCVE.org
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 products16
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.16Versions not stated
- Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.16Versions not stated
- Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.16Versions not stated
- Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.16Versions not stated
- Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.16Versions not stated
- Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.16Versions not stated
- Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.16Versions not stated
- Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.17Versions not stated
- Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.17Versions not stated
- Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.17Versions not stated
- Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.17Versions not stated
- Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.17Versions not stated
- Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.17Versions not stated
- Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.17Versions not stated
- Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2Versions not stated
- Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2Versions not stated
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Red Hat
- Published
- August 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-66785 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.