That bug is more related to the server api instead of the scripts. It affects apache long time ago and few years ago it affects nginx (2009 or so, not raelly sure of the dates).
Anyway, I have try to reproduce this bug on apache, nginx and even windows server and I havent able to do it. Recently a guy from some other upload script post that Chevereto has this leak, I contact him and he wasn't able to reproduce it either (I think that he doesn't take the time to correct his post btw).
You never can tell that your script hasn't certain bug because mostly of them are things that affect whole php enviroment. But if you always run the last versions of everything you should be ok. Believe me when I say that every reported (and unreported) bugs gets fixed asap.