  constructor(protocol) {
    this.allocStart = 0;
    this.allocStartKEX = 0;
    this._protocol = protocol;
    this._zlib = new Zlib(DEFLATE);
  }
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.