k3s v1.35.4+k3s1 released on 27-04-2026
k3s v1.35.4+k3s1 is out now. It includes an upstream Kubernetes bump to v1.35.4, bringing the patch-level bug fixes and security updates from that Kubernetes release.
See the Kubernetes v1.35.4 changelog and the k3s release notes on GitHub for the full list of CVEs, behavioral changes and component-specific details.
What’s in this release
- Kubernetes upgraded to v1.35.4, incorporating upstream bug fixes and security patches (see Kubernetes changelog).
- Embedded component updates: flannel v0.28.4, Traefik 3.6.13, containerd v2.2.3-k3s1, etcd v3.6.7-k3s1, Kine v0.14.16, CoreDNS v1.14.2, metrics-server v0.8.1, helm-controller v0.17.1, local-path-provisioner v0.0.35, SQLite 3.51.3, and runc v1.4.2.
- Build and release workflow changes: Go 1.25.9, immutable release changes, a repo state change from draft to pre-release, and April 2026 backports included for downstream stability.
Upgrade notes
- Operators should test clusters for networking, ingress, storage and runtime impacts — check Traefik, Flannel, containerd and etcd changelogs for behaviour or compatibility changes and plan a staged rollout.
- If you need to revert, the prior tag is v1.35.3+k3s1; open an issue on the k3s GitHub or join the Slack channel for assistance with rollback strategies.
Share how the upgrade goes — open issues on the k3s GitHub or drop a note on the Slack channel to report problems or unexpected behaviour.
