Unity Version

As of February 2026, the properties of Risk of Rain 2's exe indicate a File Version of 2021.3.33.23082

The Product Version field reads as "2021.3.33f1 (ee5a2aa03ab2)"

Note: A significant security vulnerability CVE-2025-59489 was identified in September 2025 affecting nearly all Unity games built from 2017 onwards.

**If you are using older version of Risk of Rain 2 from before September 12 2025, be aware of the potential security risk. **

On September 11th 2025 at 8:04:50 AM, Unity released an updated unityplayer.dll, according to its digital file signature. September 11th 2025 at 10:34:38 PM is the timestamp of Risk of Rain 2's current digital file signature.

Steam released a new Client update that blocks the launching of custom URI schemes to prevent exploitation through its distribution platform. Microsoft has their own support article. Here is the Unity notification.
NIST on CVE-2025-59489