CVE-2020-11076
In Puma (RubyGem) before 4.3.4 and 3.12.5, an attacker could smuggle an HTTP response, by using an invalid transfer-encoding header. The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.
Date published : 2020-05-22
https://github.com/puma/puma/security/advisories/GHSA-x7jg-6pwg-fx5h