CVE-2016-7798
The openssl gem for Ruby uses the same initialization vector (IV) in GCM Mode (aes-*-gcm) when the IV is set before the key, which makes it easier for context-dependent attackers to bypass the encryption protection mechanism.
Date published : 2017-01-30
http://www.securityfocus.com/bid/93031
https://github.com/ruby/openssl/commit/8108e0a6db133f3375608303fdd2083eb5115062