When the svchost is using 100 % CPU it means there is a high chance of being infected with a malware application. Firstly, I recommend installing an antivirus solution to scan your computer and then apply the latest updates through Windows Update.
As a scanning solution, you can install Malwarebytes Antimalware, then perform a full scan of your computer. After it completes, remove all the infected files found, restart the PC and then install the latest updates.
This could also be a bug in the SVChost that can be fixed by applying the available updates through Windows Update.