8.7
High
CVE-2026-66787 A flaw was found in the lighthouse component of Red Hat Advanced Cluster Management for Kubernetes
Description
A flaw was found in the lighthouse component of Red Hat Advanced Cluster Management for Kubernetes. This vulnerability stems from insufficient validation of advertised IP addresses within EndpointSlice objects. A compromised spoke cluster can exploit this by creating EndpointSlices with attacker-controlled IP addresses, causing other clusters' lighthouse DNS to redirect legitimate service traffic to malicious endpoints. This enables a remote attacker to conduct transparent Man-in-the-Middle (MITM) attacks on cross-cluster service communications, potentially leading to unauthorized information disclosure and data manipulation.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat Advanced Cluster Management for Kubernetes 2 | Versions not published | |
| Red Hat Advanced Cluster Management for Kubernetes 2.17 1788073481 | earliest → < 1788073481 | 1788073481 |
| Red Hat Advanced Cluster Management for Kubernetes 2.16 1790670912 | earliest → < 1790670912 | 1790670912 |
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