OnePlus offers new build of OxygenOS to protect OnePlus One users from Stagefright
Today, OnePlus has released a software update for its OxygenOS that allows users to flash version 1.0.2 to OnePlus One units. While the update doesn't mess with your personal files, it probably is a good idea to backup your data before installing it. Head over to the sourcelink to click on the OnePlus forum site that contains the links to the software update.
You should also take the time to read the Installation Guide offered by OnePlus on the same web page. Even if you're a seasoned pro when it comes to flashing custom ROMs and the such, it might be a good idea to give it a read before beginning the process of flashing the update. Stagefright is a dangerous exploit, and protecting your personal information is important, so make sure that you update your OnePlus One to the new OxygenOS build.
source: OnePlus via Technodify