* Patch CVE-2016-8859 in alpine based images: ([#42937](https://github.com/kubernetes/kubernetes/pull/42937), [@timstclair](https://github.com/timstclair))
    * - gcr.io/google-containers/etcd-empty-dir-cleanup
    * - gcr.io/google-containers/kube-dnsmasq-amd64
* Check if pathExists before performing Unmount ([#39311](https://github.com/kubernetes/kubernetes/pull/39311), [@rkouj](https://github.com/rkouj))

- OIDC authentication will now fail if the username asserted based on a CEL expression config is the empty string.  Previously the request would be authenticated with the username set to the empty string. ([#123568](https://github.com/kubernetes/kubernetes/pull/123568), [@enj](https://github.com/enj))

* kubectl: don't display an empty list when trying to get a single resource that isn't found ([#28294](https://github.com/kubernetes/kubernetes/pull/28294), [@ncdc](https://github.com/ncdc))
* Fix working_set calculation in kubelet ([#29154](https://github.com/kubernetes/kubernetes/pull/29154), [@vishh](https://github.com/vishh))

* validate that daemonsets don't have empty selectors on creation ([#23530](https://github.com/kubernetes/kubernetes/pull/23530), [@mikedanese](https://github.com/mikedanese))
* don't sync deployment when pod selector is empty ([#23467](https://github.com/kubernetes/kubernetes/pull/23467), [@mikedanese](https://github.com/mikedanese))

- Fixed issue in Portworx volume driver causing controller manager to crash. ([#76341](https://github.com/kubernetes/kubernetes/pull/76341), [@harsh-px](https://github.com/harsh-px))
- For an empty regular file, `stat --printf %F` will now display `regular empty file` instead of `regular file`. ([#62159](https://github.com/kubernetes/kubernetes/pull/62159), [@dixudx](https://github.com/dixudx))

* Default resourceGroup should be used when the value of annotation azure-load-balancer-resource-group is an empty string. ([#79514](https://github.com/kubernetes/kubernetes/pull/79514), [@feiskyer](https://github.com/feiskyer))

  - update distroless-iptables to v0.4.5 ([#123230](https://github.com/kubernetes/kubernetes/pull/123230), [@cpanato](https://github.com/cpanato)) [SIG Release and Testing]

### Bug or Regression

- If a pvc has an empty storageClassName, persistentvolume controller won't try to assign a default StorageClass ([#122704](https://github.com/kubernetes/kubernetes/pull/122704), [@carlory](https://github.com/carlory)) [SIG Apps and Storage]

## Dependencies

  new endpoint, the rules for the new endpoint might not be added until
  much later). ([#122756](https://github.com/kubernetes/kubernetes/pull/122756), [@hakman](https://github.com/hakman)) [SIG Network]
- If a pvc has an empty storageClassName, persistentvolume controller won't try to assign a default StorageClass ([#122704](https://github.com/kubernetes/kubernetes/pull/122704), [@carlory](https://github.com/carlory)) [SIG Apps and Storage]

### Other notable changes

* Update kube-dns to 1.14.5 ([#53114](https://github.com/kubernetes/kubernetes/pull/53114), [@bowei](https://github.com/bowei))