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The 2.19 series release notes contain important changes in this release series.

Due to a database migration error, we have disabled access to the 2.19.1 images. This error will be resolved in the next patch release.

Security Fixes

LOW: The script-src: 'unsafe-inline' CSP header was applied to all paths for Enterprise Manager.
Packages have been updated to the latest security versions.

Promoting a replica in an active HA environment could fail to properly apply configuration changes and remove a pre-flight check holding page.
In certain cluster configurations, background jobs are unable to communicate with local storage services.
Upgrading from 2.17 to 2.19 could fail with a database migration error.

The Google Accounts Daemon and google_set_hostname DHCP hook are now disabled on Google Cloud Platform images.
GitHub Enterprise Server is now available in the eu-north-1 AWS region.

On a freshly set up GitHub Enterprise Server without any users, an attacker could create the first admin user.
Custom firewall rules are not maintained during an upgrade.
Git LFS tracked files uploaded through the web interface are incorrectly added directly to the repository.
Issues cannot be closed if they contain a permalink to a blob in the same repository where the file path is longer than 255 characters.
The Let's Encrypt certificate registration feature consistently fails following an update to the external API.
When pushing to a gist, an exception could be triggered during the post-receive hook.
When "Users can search GitHub.com" is enabled with GitHub Connect, issues in private and internal repositories are not included in GitHub.com search results.
Security alerts are not reported when pushing to a repository on the command line. (updated 2020-06-23)

Thanks!

The GitHub Team