The largest compilation of nearly ten billion unique passwords, titled RockYou2024, was leaked on a popular hacking forum, posing significant risks for users prone to reusing passwords. Discovered by Cybernews researchers, the file contains 9,948,575,739 plaintext passwords and was posted by a user named ObamaCare. The leak is believed to combine data from various old and new breaches, dramatically increasing the threat of credential-stuffing attacks.

Credential stuffing attacks exploit leaked passwords to gain unauthorised access to accounts, affecting users and businesses. The RockYou2024 leak significantly heightens this risk, as previous attacks on companies like Santander and Ticketmaster demonstrated. Cybernews highlighted the need for robust security measures, such as resetting compromised passwords, using strong, unique passwords, and enabling multi-factor authentication (MFA).

The RockYou2024 leak follows the 2021 release of a similar but smaller compilation, RockYou2021, which contained 8.4 billion passwords. The new dataset has grown by 15 percent, incorporating an additional 1.5 billion passwords. The compilation is believed to include information from over 4,000 databases collected over more than two decades, making it a potent tool for cybercriminals.

To protect against potential breaches, Cybernews advises users to reset exposed passwords, use MFA, and utilise password managers. The company will also integrate RockYou2024 data into its Leaked Password Checker, allowing individuals to verify if their credentials have been compromised. The leak follows another significant breach, the Mother of All Breaches (MOAB), which involved 12 terabytes of data and 26 billion records earlier this year.