Does using many XML parsers (XDocument, XMLDocument) from the public Internet increase attack surface area?

Question

I am coding an anonymous WCF service that allows others to post XML into it.

Does using different kinds of XML parsers XDocument, XMLDocument, or even 3rd party parsers increase the attack surface area? (Buffer overflows, etc).

Answer 1

Yes. By definition, allowing user interaction with additional software increases the Attack surface.