CVE-2026-66787

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.

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Produits concernés

• Red Hat Advanced Cluster Management for Kubernetes 2.16
• Red Hat Advanced Cluster Management for Kubernetes 2.17

Scores CVSS

Faiblesses (CWE)

• CWE-345

Références

• https://access.redhat.com/errata/RHSA-2026:63016
• https://access.redhat.com/errata/RHSA-2026:85227
• https://access.redhat.com/security/cve/CVE-2026-66787
• https://bugzilla.redhat.com/show_bug.cgi?id=2507532

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories