You can see if there is an AOSP-based ROM (like LineageOS) available. In general, unless you need some Samsung-specific software, those are better anyway since

You can see if there is an AOSP-based ROM (like LineageOS) available. In general, unless you need some Samsung-specific software, those are better anyway since they have less bloatware/spyware since they are just plain Android. The attack is in their image processing library, the remote exploit comes from Samsung's messages app automatically processing MMS attachments. The twitter thread said that disabling MMS auto-download [or using another MMS app?] will probably fix that, but there could be other channels that cause the library to be used.