CVE-2026-66785
CriticalCVSS 9.9Summary
A vulnerability in Submariner allows a malicious cluster (spoke) to redirect network traffic from other connected clusters by publishing a specially crafted network endpoint. The system fails to properly validate network subnets, enabling the malicious cluster to declare arbitrary network ranges.
Risk Assessment
The risk includes unauthorized information disclosure or network disruption, as traffic from peer clusters may be rerouted through the attacker's tunnel.
Recommendation
Apply vendor patches and strengthen subnet validation in Submariner configuration.
Original NVD description (English source)
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.