Rails 188.8.131.52, 184.108.40.206, 220.127.116.11, 18.104.22.168, and 6.0.0.beta3 have been released! These contain the following important security fixes. It is recommended that users upgrade as soon as possible:
CVE-2019-5418 File Content Disclosure in Action View
CVE-2019-5419 Denial of Service Vulnerability in Action View
This just needs a smoke test after passing the automated tests.