        function callback(err, stream) {
          assert(err, msg('Expected error'));
          assert(err.message === 'No response from server',
                 msg(`Wrong error message: ${err.message}`));
          ++calledBack;
        }
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.