Medium [CVE-2026-66787] Go pprof profiling endpoint enabled unconditionally on lighthouse-agent:8082

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.

By creating unvalidated EndpointSlice objects with attacker-controlled IP addresses, a malicious actor can redirect legitimate service traffic between clusters, enabling transparent Man-in-the-Middle attacks without altering the target service. Red Hat severity: Important — CVSS 5.4 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L).

Weakness: CWE-489. Red Hat fixing advisory: RHSA-2026:63016.

Affected product named by the advisory: Red Hat Advanced Cluster Management for Kubernetes 2.17.