Every instance of the word "danger" used by Heidegger in The Question Concerning Technology and its immediate context is listed here in chronological order.
Extract of the essay containing the word "danger"
...Placed between these possibilities, man is endangered from out of destining...
...in every one of its modes, and therefore necessarily, danger...
...everything that is shows itself at any given time harbors the danger that man may quail...
...everything that is shows itself at any given time harbors the danger that man...
...but precisely through these successes the danger can remain that...
...The destining of revealing is in itself not just any danger, but danger as such...
...Yet when destining reigns in the mode of Enframing, it is the supreme danger...
...This danger attests itself to us in two ways...
...But Enframing does not simply endanger man in his relationship to himself...
...The destining that sends into ordering is consequently the extreme danger...
...What is dangerous is not technology...
...The essence of technology, as a destining of revealing, is the danger...
...if we think Enframing in the sense of destining and danger...
...Thus, where Enframing reigns, there is danger in the highest sense...
...But where danger is, grows The saving power also...
...If the essence of technology, Enframing, is the extreme danger; and if there is truth...
...In what respect does the saving power grow there also where the danger is...
...we have no right whatsoever to expect that there where the danger is we should be able...
...thence thrive even in that wherein the extreme danger lies, in the holding sway...