https://newatlas.com/krack-wi-fi-security-vulnerability/51781/

A computer security researcher from Belguim's KU Leuven has inadvertently discovered a major security flaw in the WPA2 protocol that protects the majority of Wi-Fi networks. This revelation means that every device using WPA2 Wi-Fi security is vulnerable to being spied on, and simply changing your password won't prevent an attack.