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containerd 1.6.6

Welcome to the v1.6.6 release of containerd!

The sixth patch release for containerd 1.6 includes a fix for
[GHSA-5ffw-gxpp-mxpf](https://github.com/containerd/containerd/security/advisories/GHSA-5ffw-gxpp-mxpf).

### Notable Updates

* **Fix ExecSync handler to cap console output size** ([GHSA-5ffw-gxpp-mxpf](https://github.com/containerd/containerd/security/advisories/GHSA-5ffw-gxpp-mxpf))

See the changelog for complete list of changes

Please try out the release binaries and report any issues at
https://github.com/containerd/containerd/issues.

### Contributors

* Derek McGowan
* Kazuyoshi Kato

### Changes
<details><summary>4 commits</summary>
<p>

* Github Security Advisory [GHSA-5ffw-gxpp-mxpf](https://github.com/containerd/containerd/security/advisories/GHSA-5ffw-gxpp-mxpf)
  * [`61213742a`](https://github.com/containerd/containerd/commit/61213742a8e57458cd6432c46eee9dd35e0584c7) Prepare release notes for v1.6.6
  * [`f92068350`](https://github.com/containerd/containerd/commit/f92068350f189040a3bc41f9aa65994c8aba796a) Implicitly discard the input to drain the reader
  * [`2eb67213b`](https://github.com/containerd/containerd/commit/2eb67213b8ec38f5d7233cf0098763d9364e2a17) [release/1.6] Limit the response size of ExecSync
</p>
</details>

### Dependency Changes

This release has no dependency changes

Previous release can be found at [v1.6.5](https://github.com/containerd/containerd/releases/tag/v1.6.5)