function next() {
  if (++f < files.length) {
    spawn(process.argv[0], [ files[f] ], { stdio: 'inherit' })
      .on('exit', function(code) {
        if (code === 0)
          process.nextTick(next);
        else
          process.exit(code);
      });
  }
}
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.