The Drupal.org Security Team and Infrastructure Team has discovered unauthorized access to account information on Drupal.org and groups.drupal.org. This access was accomplished via third-party software installed on the Drupal.org server infrastructure, and was not the result of a vulnerability within Drupal itself. This notice applies specifically to user account data stored on Drupal.org and groups.drupal.org, and not to sites running Drupal generally. Information exposed includes usernames, email addresses, and country information, as well as hashed passwords... All Drupal.org passwords are both hashed and salted, although some older passwords on some subsites were not salted
Users are encouraged to update their Drupal.org passwords and the passwords of any accounts that could be linked via the compromised information.