- Structured Authentication Configuration now supports `DiscoveryURL`. If specified, `discoveryURL` overrides the URL used to fetch discovery information. This is for scenarios where the well-known and jwks endpoints are hosted at a different location than the issuer (such as locally in the cluster).
   ([#123527](https://github.com/kubernetes/kubernetes/pull/123527), [@aramase](https://github.com/aramase))

A security issue was discovered in kube-apiserver that could allow an attacker controlled aggregated API server to redirect client traffic to any URL.  This could lead to the client performing unexpected actions as well as leaking the client's credentials to third parties. 

- The endpointslice mirroring controller mirrors endpoints annotations and labels to the generated endpoint slices, it also ensures that updates on any of these fields on the endpoints are mirrored. 
  The well-known annotation endpoints.kubernetes.io/last-change-trigger-time is skipped and not mirrored. ([#100443](https://github.com/kubernetes/kubernetes/pull/100443), [@aojea](https://github.com/aojea)) [SIG Apps, Network and Testing]

### (No, really, you MUST read this before you upgrade)

- Fixed a bug which the scheduler didn't correctly tell plugins Node deletion.

- Kubeadm: added the ControlPlaneKubeletLocalMode feature gate. It can be used to tell kubeadm to use the local kube-apiserver endpoint for the kubelet when creating a cluster with "kubeadm init" or when joining control plane nodes with "kubeadm join".  The "kubeadm join" workflow now includes two new experimental phases called "con...

while we don't commit to deterministic execution with respect // to the rand stream, we also don't apply MaybeReadByte, so per Hyrum's Law // it's probably relied upon by some. It's a tolerable promise because a // well-specified number of random bytes is included in the signature, in a // well-specified way. if saltLength < 0 { return nil, errors.New("crypto/rsa: salt length cannot be negative") } // FIPS 186-5, Section 5.4(g): "the length (in bytes) of the salt (sLen) // shall satisfy 0 ≤ sLen ≤ hLen"....

It upgrades the version of Starlette to `0.15.0`, now based on [AnyIO](https://anyio.readthedocs.io/en/stable/), and the internal async components in **FastAPI** are now based on AnyIO as well, making it compatible with both **asyncio** and **Trio**.

You can read the docs about running [FastAPI with Trio using Hypercorn](https://fastapi.tiangolo.com/deployment/manually/#hypercorn-with-trio).

- Fixed a regression introduced in 1.33 where some paginated LIST calls fell back to `etcd` instead of being served from cache. ([#132244](https://github.com/kubernetes/kubernetes/pull/132244), [@hakuna-matatah](https://github.com/hakuna-matatah))

- The apiserver debug endpoint `/debug/api_priority_and_fairness/dump_requests` has been extended to dump executing requests as well as queued ones.  A column for StartTime has been added to the returned table, with the queued requests having a StartTime of "0001-01-01T00:00:00Z".  The executing requests have a RequestIndexInQueue of -1, and the QueueIndex is also -1 for priority...