I read somewhere that long desired "life" on Mars that's still not really found, could be "endangered" by microorganisms on robots we send there to explore, it would be highly awkward, if anything similar to sth considered "living" would end up of Earth's origin just because of our carelessness XD
It was only some kind of funny warning I guess... if it's even possible, don't know
And I think there is one organism capable of "surviving" in space, it was tardigrade I think, but it's still looong far from the actual living...