UPDATE 4/22/2020: Valve has indicated that the leaked source code is nothing for players on current builds of Counter-Strike to be concerned about.

Original story follows.

According to various reports, source code for both Team Fortress 2 and Counter-Strike: Global Offensive have leaked online. The code is at least a couple of years old and was reportedly posted on 4chan. In any case, it's being recommended that Steam users avoid playing games like Counter-Strike: GO and Team Fortress 2 for the time being, as they will potentially be putting their PC at risk by doing so.

Valve has yet to comment on the situation at the time of this writing, and it's unclear if it's really as big of a deal as it seems on the surface. PCGamesN has noted that the code is potentially outdated and so it's possible that people avoiding Team Fortress 2Counter-Strike: Global Offensive, and other Valve games may be taking unnecessary precautions. Even so, players may want to play it safe just in case and avoid playing the games for now.

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While Valve has yet to release a statement on the situation, various fan projects and community servers are shutting down until it's resolved. There's concern that remote code execution and other major security risks, along with general damage to one's PC, are all possible by playing these games online right now.

We will update this post as soon as more information is available. Until then, it may be wise for Steam users to avoid playing Team Fortress 2Counter-Strike: Global Offensive, or other Valve games online.

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Source: PCGamesN, TechRadar