The Fiddle::Handle implementation in ext/fiddle/handle.c in Ruby before 2.0.0-p648 2.1 before 2.1.8 and 2.2 before 2.2.4 as distributed in Apple OS X before 10.11.4 and other products mishandles tainting which allows context-dependent attackers to execute arbitrary code or cause a denial of service (application crash) via a crafted string related to the DL module and the libffi library. NOTE: this vulnerability exists because of a CVE-2009-5147 regression.