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-2026-66787
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 — Lighthouse: go pprof profiling endpoint enabled unconditionally on lighthouse-agent :8082
AV AC PR UI S C I A CVSS EPSS %ile KEV
A L N N U L N L 5.4 .0035 26.8 —
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-2026-66787 (Red Hat Advanced Cluster Management for Kubernetes 2). CVSS 8.7 → 5.4 (NVD).
Sep 2 PATCH SHIPPED — CVE-2026-66787 (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 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.
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-2026-66787 (Red Hat Advanced Cluster Management for Kubernetes 2). CVSS 8.7 → 5.4 (NVD). |
| September 2, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-66787 (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-2026-66787 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.
