ruby -- Object taint bypassing in DL and Fiddle in Ruby

Ruby Developers report:

There is a vulnerability in DL and Fiddle in Ruby where tainted
strings can be used by system calls regardless of the $SAFE level
set in Ruby.

Native functions exposed to Ruby with DL or Fiddle do not check the
taint values set on the objects passed in. This can result in
tainted objects being accepted as input when a SecurityError
exception should be raised.