Extended maintenance of Ruby versions 1.8.7 and 1.9.2 ended on July 31, 2014. Read more
Raised when attempting a potential unsafe operation, typically when the $SAFE level is raised above 0.
foo = "bar" proc = Proc.new do $SAFE = 4 foo.gsub! "a", "*" end proc.call
raises the exception:
SecurityError: Insecure: can't modify string