That looks to be a 'True Bug' nymph. Most likely a squash bug nymph. They can do a lot of damage to all plants of the squash/cucumber family.

If you squish it, you'll smell a foul odor, but it must be done!

Oh, and on a second look. I think I see an adult squash bug in the bottom center of the photo.

Really need a closer picture to of the bug itself be sure. They may very well be squash bugs. But the abdomen doesn't look quite right for squash bug nymphs - it's a bit too wide - and the legs don't appear to be black. I'm gonna guess stink bug nymphs. Either way they are bad guys.

Dave

I they are all over everything, could be young brown marmorated stink bugs, the ones that will start coming inside in a month. I found some in my tomatoes this week. Squish.