Almost every Wi-Fi network could have been compromised, according to the US government. A problem with the WPA 2 standard – used in almost every home Wi-Fi network – means that potentially any network using it could be broken into, according to a new warning. Once that’s happened, anything on the network is exposed, meaning that hackers could snoop on traffic that is being sent over them. Researchers led by Mathy Vanhoef are due to reveal details of the exploit, known as KRACK, later today. But the US government has already revealed some details, in a warning that suggests the problem could be rife across the entire world.