A huge database with email addresses, passwords in clear text, and partial credit card data has been uploaded to a free, public hosting service. The total number of unique email addresses and plain text passwords in the collection is 41,826,763 and they were uploaded to the anonymous file hosting service kayo.moe. The operator of the sharing service sent the set to Troy Hunt, Australian security researcher and creator of the Have I Been Pwned data breach index site, to compare it and check whether it was the result of an unknown data breach.
Source: https://www.bleepingcomputer.com/news/security/files-with-42-million-emails-and-passwords-found-on-free-hosting-service/