Setting Humanoid.HipHeight to NAN causes Roblox to hang

Bug Reports Engine Bugs
#1

If you set the value of a Humanoid’s HipHeight to NAN (0/0), The game client hangs.
This can be used to crash servers if a game doesn’t have FilteringEnabled set to true.

#2

Does this replicate before crashing the client/server?

#3

I haven’t been able to test yet. Possibly not, but this shouldn’t be happening in the first place.

#4

I’ll fix this, I’ll probably just check if the value is NaN when you are trying to set it and output a warning if it is.

#5

Interesting. There is a NaN check and limits for this property due to a previous exploit.

Have you verified that this works? Is there any special method you are using to set HipHeight to NaN?

#6

This is interesting, I see the NaN check but I can still reproduce the issue with the following code in production Studio.

game.Workspace.Player1.Humanoid.HipHeight = 0/0

Edit: Figured it out, I’ll fix it.