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containerd 1.6.12

Welcome to the v1.6.12 release of containerd!

The twelfth patch release for containerd 1.6 contains a fix for CVE-2022-23471.

### Notable Updates
* **Fix goroutine leak during Exec in CRI plugin** ([GHSA-2qjp-425j-52j9](https://github.com/containerd/containerd/security/advisories/GHSA-2qjp-425j-52j9))

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
* Danny Canter
* Phil Estes
* Sebastiaan van Stijn

### Changes
<details><summary>5 commits</summary>
<p>

* Github Security Advisory [GHSA-2qjp-425j-52j9](https://github.com/containerd/containerd/security/advisories/GHSA-2qjp-425j-52j9)
  * Prepare release notes for v1.6.12
  * CRI stream server: Fix goroutine leak in Exec
* [release/1.6] update to go1.18.9 ([#7766](https://github.com/containerd/containerd/pull/7766))
  * [release/1.6] update to go1.18.9
</p>
</details>

### Dependency Changes

This release has no dependency changes

Previous release can be found at [v1.6.11](https://github.com/containerd/containerd/releases/tag/v1.6.11)