Acquia Drupal 1.2.59 (Drupal 6.31 core from Pressflow) contains the following updates:

Security updates
* Updated Drupal core to version 6.31 (https://drupal.org/drupal-6.31-release-notes"). This also fixes an Information Disclosure security issue described in DRUPAL-SA-CORE-2014-002 (https://drupal.org/SA-CORE-2014-002).