Networking Vulnerability in Cilium by Isovalent
CVE-2026-26963

6.1MEDIUM

Key Information:

Vendor: Cilium
Status: Cilium
Vendor: CVE Published:; 19 February 2026

What is CVE-2026-26963?

The vulnerability in Cilium allows unauthorized network traffic between Pods located on different nodes when Native Routing, WireGuard, and Node Encryption features are enabled. This issue compromises the expected traffic control, making systems susceptible to potential unauthorized access. This flaw impacts Cilium versions 1.18.0 through 1.18.5 and has been successfully patched in version 1.18.6. For detailed information, refer to the official advisories and release notes.

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