They're probably not safe to eat. Your best bet is to throw out the entire batch of mangoes, since they are considered spoiled.

Don't eat it! You don't want worms inside you, devouring your intestines, not worth it.

Eat the worm free ones, you don't want to risk it.

Thanks for answering my Q, your words were enlightening..

I was eating those small yellow mangoes until I realized it was black with worms in it once I had bitten the mango. The outside looked normal so I wouldn't have known. I've heard of white worms but these were black, are they harmless too? Thanks