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-2026-66785
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 — Submariner: ipsec psk secrets file created with default world-readable permissions
AV AC PR UI S C I A CVSS EPSS %ile KEV
L H L N U L N N 2.5 .0013 2.0 —
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 1788043964
Red Hat Advanced Cluster Management for Kubernetes 2.17 unspecified 1788043961
Red Hat Advanced Cluster Management for Kubernetes 2.17 unspecified 1788073481
Red Hat Advanced Cluster Management for Kubernetes 2.17 unspecified 1788043970
Red Hat Advanced Cluster Management for Kubernetes 2 unspecified —
Red Hat Advanced Cluster Management for Kubernetes 2 unspecified —
TIMELINE
Jul 27 Reserved by redhat
Aug 20 Published (CNA: redhat)
Sep 1 RESCORED — CVE-2026-66785 (Red Hat Advanced Cluster Management for Kubernetes 2). CVSS 9.9 → 2.5 (NVD).
Sep 2 PATCH SHIPPED — CVE-2026-66785 (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 Submariner. This vulnerability allows a malicious cluster (spoke) to redirect network traffic from other connected clusters (peer clusters) by publishing a specially crafted network endpoint. The system fails to properly validate the network subnets provided by the malicious cluster, enabling it to declare arbitrary network ranges. Consequently, all network traffic intended for these arbitrary ranges from peer clusters will be rerouted through the attacker's tunnel, potentially leading to unauthorized information disclosure or network disruption.
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-2026-66785 (Red Hat Advanced Cluster Management for Kubernetes 2). CVSS 9.9 → 2.5 (NVD). |
| September 2, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-66785 (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 — 9 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 | — | — | 1788043964 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.17 | — | — | 1788043961 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.17 | — | — | 1788073481 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.17 | — | — | 1788043970 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2 | — | — | — |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2 | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-66785 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.
