Here’s Why Your Steam Games Have Been Updating Like Crazy in the Last 24 Hours
Maybe you’ve noticed that today an unusual number of your Steam games have received updates. The reason for this was a critical security vulnerability (CVE-2025-59489) in Unity games. This issue affects all games using Unity from version 2017.1 onwards.
Don’t worry — there’s no active exploit known yet, but precautionary measures are underway to protect everyone. Major companies like Unity, Valve, Microsoft, and Google are working together to fix the issue as quickly as possible.
I. Understanding the Unity Vulnerability
The security flaw, as mentioned earlier, is CVE-2025-59489. It’s a vulnerability within the Unity runtime code that went unnoticed for years. It was discovered by security researcher RyotaK, who responsibly disclosed the issue. This flaw allows the injection of arguments that can load malicious libraries. As a result, attackers could perform remote code executions (RCE) and potentially gain control of other users’ devices.
Affected platforms include Windows, Android, macOS, and Linux. The risk is lower on Linux and HorizonOS, and it’s not exploitable on iOS. The issue impacts all games/apps using Unity 2017.1–2025.x. Fortunately, Unity reacted quickly. From version 2019.1 onwards, patches were developed to address the problem. Additionally, a binary patch tool has been made available for developers working on older builds. Unfortunately, anti-cheat systems need to be rebuilt.
Protective Measures in Practice
Unity is collaborating with major companies like Valve, Microsoft, Google, and Meta, all of which have responded swiftly:
Steam: Updated client now includes additional security checks.
Microsoft Defender: Detects and blocks any exploit attempts.
Android: Play Protect and sandboxing prevent malicious code execution.
Linux: Minimal risk thanks to strong system privilege restrictions.
Horizon OS (Meta): Additional security policies enabled.
Rest assured, there have been no reported exploits in the wild, meaning it was likely not discovered or used by anyone else. Platforms are taking preventive action to ensure stability — there’s no need for panic.
What Developers and Players Should Do
Developers should update their games to the latest Unity version and also patch ongoing projects. Several tools have been released for this purpose. Anti-cheat systems must be fully recompiled. After patching, developers might need to retest stability and compatibility.
And what should players do? First of all, don’t worry too much — just update all your games that have patches available. It’s also smart to enable automatic updates so fixes install right away. Make sure your antivirus software (like Microsoft Defender) is up to date. Until all updates are completed, it’s best to avoid downloading unknown mods for Unity games. On Steam, you can also verify the integrity of game files for extra safety.
Risks from Mods
Mods for Unity games, especially new ones, may contain unsafe code or libraries. This is particularly dangerous on unofficial mod sites or poorly verified downloads. So, only download mods from official sources like the Steam Workshop, NexusMods, or Mod.io. It’s a good idea to hold off on new mods for a few days until most games have implemented their patches.
Conclusion
As we’ve seen, Unity acted quickly and transparently, keeping security as the top priority. But let’s be clear: there’s no reason to panic — simply install all updates and avoid unverified mods and you’ll be fine. This was a great example of developers, players, and platforms working together. Staying informed about such issues helps ensure safety and prevents unnecessary mistakes.
Hey, I’m Kilian, but online you’ll probably know me as “Tux1243.” I've been part of the team for almost two years now, always trying to keep you in the loop with the latest and coolest gaming news. I also have a huge passion for doing deep dives and detailed analyses of entire game series and franchises. I love getting to the bottom of things and exploring the little details and backstories that make game worlds so fascinating.
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