Found little whitish worms with brown heads in cat food dish - help!?

I opened up a new bag of Friskies indoor dry cat food last week, which I've been feeding to my kitty, and then last night I happened to look closely in his food bowl and noticed these nasty tiny little whitish/yellowish worms with brownish heads wriggling around - yuck!! Obviously, I threw out that food and disinfected his bowl as well as his food and bathroom areas with clorox wipes. I looked at the food bag and noticed dead little wormy larvae things along the glued edge, and when I dumped out the food in a big bowl, there were lots of these live tiny, tiny worms that curled up into a little "c" when touched. WHAT ARE THESE THINGS?!?! And are they harmful to my kitty? They don't look like the big fat maggot worms I;ve seen on TV, etc. There were also a couple moths in the food bag, so I'm thinking moth larvae.....? Has anyone else had this happen to them with dry food only? I'm taking a stool sample to the vet, just in case, but I'm so worried and grossed out - thanks for your help!