News › networking
By Zayden R., September 14, 2026
Cilium 1.20 introduces Gateway API enhancements and IPv6 support in ENI IPAM mode. Engineers benefit from improved traffic management and extended cloud provider capabilities.
Cilium 1.20 has landed, bringing significant improvements in traffic management and cloud provider extensibility. This release, the second major update in 2026, enhances the Gateway API by jumping from version 1.4 to 1.6. Key additions include ExternalAuth, CORS filters, ListenerSets, and support for TCPRoute and UDPRoute, broadening the capabilities for managing non-HTTP traffic. These changes mean platform and security teams can now handle more north-south traffic through a unified API, with authentication and authorization managed before requests reach the application layer.
For those still relying on Ingress NGINX, Cilium now offers a compelling reason to switch, allowing the CNI to manage traffic more effectively.
Cilium's evolution into a platform that cloud providers can extend is marked by the introduction of datapath plugins. Developed by Google, these plugins transform Cilium from a static networking appliance into a dynamic network operating system. This allows cloud providers to integrate their eBPF programs independently of Cilium's release cycle, fostering innovation alongside standardization.
On the networking front, Cilium 1.20 addresses a long-standing gap by supporting IPv6 in ENI IPAM mode on AWS. This update brings feature parity between IPv4 and IPv6, fulfilling a four-year-old feature request and rendering certain documentation obsolete. This enhancement is a welcome development for engineers seeking comprehensive IPv6 support in their AWS deployments.
The release also aligns more closely with the Kubernetes ecosystem, supporting stable MCS API and Kubernetes ClusterNetworkPolicy. These alignments offer users the flexibility to choose between Cilium-native features and portable Kubernetes resources.
Cilium 1.20 represents a solid step forward, thanks to the contributions of engineers from organizations like Datadog, Google, and Microsoft, among others.