through the built-in NodeRestriction admission plugin.

**Affected Versions**:
  - kube-apiserver v1.20.0 - v1.20.5
  - kube-apiserver v1.19.0 - v1.19.9
  - kube-apiserver <= v1.18.17

**Fixed Versions**:
  - kube-apiserver v1.21.0
  - kube-apiserver v1.20.6
  - kube-apiserver v1.19.10
  - kube-apiserver v1.18.18

This vulnerability was reported by Rogerio Bastos & Ari Lima from RedHat

    * The body size limit does not apply to subresources like pods/proxy that proxy request content to another server.

    * The body size limit does not apply to subresources like pods/proxy that proxy request content to another server.

cloud.google.com/gcr/images/k8s-artifacts-prod/us/kube-apiserver) | [amd64](https://console.cloud.google.com/gcr/images/k8s-artifacts-prod/us/kube-apiserver-amd64), [arm](https://console.cloud.google.com/gcr/images/k8s-artifacts-prod/us/kube-apiserver-arm), [arm64](https://console.cloud.google.com/gcr/images/k8s-artifacts-prod/us/kube-apiserver-arm64), [ppc64le](https://console.cloud.google.com/gcr/images/k8s-artifacts-prod/us/kube-apiserver-ppc64le), [s390x](https://console.cloud.google.com/gcr...

    * The body size limit does not apply to subresources like pods/proxy that proxy request content to another server.

* The kube-apiserver [basic audit log](https://kubernetes.io/docs/admin/audit/) can be enabled in GCE by exporting the environment variable `ENABLE_APISERVER_BASIC_AUDIT=true` before running `cluster/kube-up.sh`. This will log to `/var/log/kube-apiserver-audit.log` and use the same `logrotate` settings as `/var/log/kube-apiserver.log`. ([#41211](https://github.com/kubernetes/kubernetes/pull/41211), [@enisoc](https://github.com/enisoc))...

* Add apiserver metric for number of requests dropped because of inflight limit. ([#58340](https://github.com/kubernetes/kubernetes/pull/58340), [@gmarek](https://github.com/gmarek))
* Add apiserver metric for current inflight-request usage. ([#58342](https://github.com/kubernetes/kubernetes/pull/58342), [@gmarek](https://github.com/gmarek))

    * If you are upgrading your Cluster Federation components from v1.3.x, please run this command to migrate the federation-apiserver-secret to federation-apiserver-kubeconfig serect;
    ```$ kubectl --namespace=federation get secret federation-apiserver-secret -o json | sed 's/federation-apiserver-secret/federation-apiserver-kubeconfig/g' | kubectl create -f -```
    * You might also want to delete the old secret using this command:

        *  Don't break metric storage when duplicate pod metrics encountered causing hpa to fail
* kube-apiserver: Fixed a regression accepting patch requests > 1MB ([#84963](https://github.com/kubernetes/kubernetes/pull/84963), [@liggitt](https://github.com/liggitt))

* kube-apiserver: Fixed a regression accepting patch requests > 1MB ([#84963](https://github.com/kubernetes/kubernetes/pull/84963), [@liggitt](https://github.com/liggitt))