Rails PoC exploits for CVE-2013-0156 and CVE-2013-0155
ronin-ruby.github.com
ronin-ruby.github.com
There are at least two YAML parsing libraries (psych/syck) and they both have different behaviours as well.
But a lot of rails 3.x apps are going to be running 1.9.3
You should release your PoC(s) as well.