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Steam Just Suffered the Biggest Leak in Video Game History

The torrent includes beta builds for thousands of games, and researchers are cataloging the contents on GitHub, with Portal 2 and Left 4 Dead 2 confirmed.

  • Thirteen terabytes of Steam depot data spanning 2003 to 2013 leaked online within the past 24 hours, exposing early beta builds for thousands of games including Portal and Left 4 Dead.
  • Gabe Follower reported the data originated from a "publicly accessible endpoint" on Steam servers; the Steam2 depot files span the period before Valve switched to a new storage system in 2013.
  • GitHub users are actively cataloging the massive leak, which includes beta builds for Dragon Age: Origins and Batman: Arkham Asylum, confirming the data appears genuine despite no official Valve response.
  • Elan Ruskin, an ex-Valve developer who worked on Half-Life and Episode Two, addressed the "prerelease" builds, stating "every good idea we had went into the final thing we shipped."
  • Community members warn further discoveries from the 12 TB data dump are expected over the next few days, while observers cautioned gamers to treat any purported Half-Life 3 "leaks" with skepticism.
Insights by Ground AI

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An error in an endpoint of Steam's old infrastructure would have exposed between 12 and 13 TB of historical archives, including unpublished builds of Portal 2, Left 4 Dead and Counter-Strike: Global Offensive, in addition to material related to the cancelled Half-Life 2: Episode 3.

Valve's 12 TB data leak revealed previously unseen development files for games from the Steam2 era, such as Half-Life 2 and Portal 2.

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cybersport.ru broke the news on Saturday, August 29, 2026.
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