https://www.theregister.co.uk/2019/10/29/whatsapp_sue_nso_group/

Updated Facebook and its WhatsApp subsidiary on Tuesday sued NSO Group alleging the Israel-based spyware maker unlawfully hacked smartphones using a vulnerability in the popular chat app.

The complaint [PDF], filed in a US district court in San Francisco, blames NSO for a cyberattack on WhatsApp users that was publicly disclosed in May and thwarted with a software update.