You may want to think twice before sharing a flash drive. 

New research shows that the USB port can be used to steal personal information or infect your computer. 

A team of German security researchers says that anything connected via USB can be reprogrammed. They warn that it could even pose as a network card and reroute your Internet use so that someone could spy on what you're doing. 

Researchers believe it can also happen if someone charges their Android device using a computer USB port.