Valve Steam Infrastructure Leak Exposes 13TB of Game Data

A massive data leak, dubbed the teraleak or Steam2 leak, has exposed between 12 and 13 terabytes of internal development data from the infrastructure of Valve Corporation. The archive contains thousands of game depots dating from 2003 to 2013, including unreleased builds, prototypes, and playtest versions of titles such as Portal 2, Left 4 Dead 2, and Counter-Strike: Global Offensive.

Of particular interest to the gaming community are assets from F-Stop, a canceled Portal prequel, and potential information regarding the long-delayed Half-Life 2: Episode Three. Because the leak encompasses a decade of Steam uploads, it also includes beta builds for third-party titles, including Dragon Age: Origins, Batman: Arkham Asylum, Fallout: New Vegas, Sonic 4, and Alan Wake.

Reports on the cause of the exposure vary. Initial findings suggest the leak resulted from an incorrectly exposed API endpoint in a retired content-delivery pipeline that lacked password protection, rather than a targeted hacking attempt. However, some sources suggest the breach may have occurred on third-party servers hosting previously leaked data. Valve Corporation has not yet commented on the incident.