Ah, you’re referring to that. Sorry, “source code games” misleaded me. Anyways, I don’t see any more risk than whatever source games already were. They are extremely exploitable and the injection of arbitrary code has always been there.
I see the leak as a benefit, instead, because the community can help fixing possible vulnerabilities. There are plenty of games which are open source and they are safer than any AAA game out there. That’s because any kind of exploit is widely known to the community, or anyways it can be dealt with pretty fastly. Take a look at Quake III Arena, from the glorious id Software. Now it’s GPL but there is also an open source alternative that basically the same engine, ioquake3, and it’s now one of the biggest games ever, in terms of content, because there’s a huge community support that keeps adding things (even if now it’s almost dead). From it, forks have been made, for example Warsow, in which I developed some gametypes and mods, after more than a decade of gameplay I can tell you that the community is completely safe, despite very known exploits (some of which got fixed by the community and devs, but others were kept because they’re funny).
I am somehow happy about this leak, although it doesn’t change much, since the Source engine SDK was released by Valve long time ago - if one wants to find an exploit, that’s where they look at. Game-specific codes aren’t a big deal when you already know whatever is behind them.
Still, thanks for the news, I find it interesting and I’ll look further into it