# Chef 12.21.10 Release

**URL:** <https://discourse.chef.io/t/chef-12-21-10-release/11483>\
**Category:** Chef Release Announcements\
**Created:** [September 12, 2017, 3:14am UTC](https://discourse.chef.io/t/chef-12-21-10-release/11483 "2017-09-12T03:14:10Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![cheeseplus](https://sea2.discourse-cdn.com/flex016/user_avatar/discourse.chef.io/cheeseplus/32/960_2.png) [@cheeseplus](https://discourse.chef.io/u/cheeseplus)\
**Post date:** [September 12, 2017, 3:14am UTC](https://discourse.chef.io/t/chef-12-21-10-release/11483/1 "2017-09-12T03:14:10Z")

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Hi!

We’ve released another small patch release to Chef 12, 12.21.10, with a security fix to address the recent RubyGems vulnerability as well as some some backported performance improvements to node attributes.

Chef Client 12.21.10 includes RubyGems 2.6.13 to fix the following CVEs:

- CVE-2017-0899
- CVE-2017-0900
- CVE-2017-0901
- CVE-2017-0902

See the [full changelog](https://github.com/chef/chef/compare/v12.21.4...v12.21.10) for more details.