BIT-CILIUM-2026-26963 Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Versions 1.18.0 through 1.18.5 will incorrectly permit traffic from Pods on other nodes when Native Routing, WireGuard and Node Encryption are enabled. This issue has been fixed in version 1.18.6...

BIT-CILIUM-OPERATOR-2026-26963 Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Versions 1.18.0 through 1.18.5 will incorrectly permit traffic from Pods on other nodes when Native Routing, WireGuard and Node Encryption are enabled. This issue has been fixed in version 1.18.6...

CVE-2026-26963

CVE-2026-26963 affects Cilium: vulnerable in versions 1.18.0–1.18.5 where traffic from Pods on other nodes can bypass isolation when Native Routing, WireGuard and Node Encryption are enabled. Root cause is the eBPF datapath handling allowing cross-node traffic leakage under those configurations. ...

CVE-2026-26963 Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Versions 1.18.0 through 1.18.5 will incorrectly permit traffic from Pods on other nodes when Native Routing, WireGuard and Node Encryption are enabled. This issue has been fixed in version 1.18.6...

Cilium may not enforce host firewall policies when Native Routing, WireGuard and Node Encryption are enabled

Impact Host Policies will incorrectly permit traffic from Pods on other nodes when all of the following configurations are enabled: Native Routing WireGuard Node Encryption beta These options are disabled by default in Cilium. Patches This issue was fixed by 42892. This issue affects: Cilium v1.1...