CVE-2026-66787Lighthouse: lighthouse: cross-cluster dns spoofing via unvalidated endpointslice ip addresses

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.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• RHSA-2026:63016 vendor-advisory
• RHSA-2026:85227 vendor-advisory
• https://access.redhat.com/security/cve/CVE-2026-66787 vdb-entry
• RHBZ#2507532 issue-tracking