CVE-2012-4466
Ruby 1.8.7 before patchlevel 371, 1.9.3 before patchlevel 286, and 2.0 before revision r37068 allows context-dependent attackers to bypass safe-level restrictions and modify untainted strings via the name_err_mesg_to_str API function, which marks the string as tainted, a different vulnerability than CVE-2011-1005.
Date published : 2013-04-25
http://www.ruby-lang.org/en/news/2012/10/12/cve-2012-4464-cve-2012-4466/