Is there a way to solve terminator artifacts?

From blender 2.90, you can tweak this using the Object's Shadow Terminator Offset Shading property.

Terminator artifacts are a complicated topic of raytracing. From a technical point of view the normal of the face shows the way from the light source. Therefore the face is not illuminated by light and a shadow is cast at the right place. Even if it is technically expected behavior and does not mean a "bug" - from the user's point of view this is often not the desired effect of smooth shading.

Source: wiki.povray.org

Simple measures to work around the problem are:

• More geometry through subdevision
• or create the normals with a high resolution mesh and back to the low res mesh
• large area lighting

Some render engines work around this problem in different ways. Requests for solution of this problem are in the bugtracker for a while now. current information can be found here.