      cb: (err, data, nb) => {
        if (err) {
          if (cb._wantEOFError || err.code !== STATUS_CODE.EOF)
            return cb(err);
        } else if (nb > len) {
          return cb(new Error('Received more data than requested'));
        }
        cb(undefined, nb || 0, data, position);
      },
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.