Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-66788
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 — Lighthouse: dockerfile build stages use end-of-life fedora 40 referenced by mutable tag
AV AC PR UI S C I A CVSS EPSS %ile KEV
N H N N U N L N 3.7 .0045 36.7 —
AFFECTED
Product Versions Fixed
Red Hat Advanced Cluster Management for Kubernetes 2.17 unspecified 1788023916
Red Hat Advanced Cluster Management for Kubernetes 2.17 unspecified 1788023940
Red Hat Advanced Cluster Management for Kubernetes 2.17 unspecified 1788105072
Red Hat Advanced Cluster Management for Kubernetes 2.17 unspecified 1788073481
TIMELINE
Jul 27 Reserved by redhat
Aug 20 Published (CNA: redhat)
Sep 1 RESCORED — CVE-2026-66788 (Red Hat Advanced Cluster Management for Kubernetes 2). CVSS 9.9 → 3.7 (NVD).
Sep 2 PATCH SHIPPED — CVE-2026-66788 (Red Hat Advanced Cluster Management for Kubernetes 2.17). Fixed in Red Hat Advanced Cluster Management for Kubernetes 2.17 1788023916.
Description
A flaw was found in Lighthouse. A remote attacker, by compromising a spoke cluster, can exploit a vulnerability where the destination namespace for resource injection is derived from an attacker-controlled label or annotation on the broker object. This allows the attacker to inject unauthorized EndpointSlices and ServiceImports into any namespace on peer clusters, including critical system namespaces like kube-system and openshift-*. This could lead to privilege escalation or other forms of system compromise within the cluster.
Lifecycle
Complete event history — 4 events, chronological
| Date | Event | Detail |
|---|
| July 27, 2026 | Reserved | Reserved by redhat |
| August 20, 2026 | Published | Published (CNA: redhat) |
| September 1, 2026 | RESCORED | RESCORED — CVE-2026-66788 (Red Hat Advanced Cluster Management for Kubernetes 2). CVSS 9.9 → 3.7 (NVD). |
| September 2, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-66788 (Red Hat Advanced Cluster Management for Kubernetes 2.17). Fixed in Red Hat Advanced Cluster Management for Kubernetes 2.17 1788023916. |
Affected
Affected products and packages — 4 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.17 | — | — | 1788023916 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.17 | — | — | 1788023940 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.17 | — | — | 1788105072 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.17 | — | — | 1788073481 |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-66788 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
