Network Traffic Redirection Vulnerability in Submariner by Red Hat
CVE-2026-66785

9.9CRITICAL

Key Information:

Vendor

Red Hat
Status
Red Hat Advanced Cluster Management For Kubernetes 2
Vendor
CVE Published:
20 August 2026

What is CVE-2026-66785?

A vulnerability exists in Submariner that enables a malicious cluster to misdirect network traffic from connected peer clusters. By incorrectly validating network subnets, an attacker can create a fabricated network endpoint that declares arbitrary network ranges. As a result, any traffic directed to these ranges is rerouted through the attacker's tunnel, which could lead to potential information leaks or disruption of network services.

References

https://access.redhat.com/security/cve/CVE-2026-66785
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2507530
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
9.9
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.