Memory leak - using cursor function - fetchone

It is reported by one of our customers, using the cursor functions: fetchone, observing the memory consumption and slowly leading to high memory usage, possible some sort of memory leak.

Customer comments:
Python version is - Python 3.6..
Find attached small program we stripped out using the MariaDB library. The program almost double in size in ~ 48hrs and still growing.
The pattern of growth is around 200K per hour. After the initial growth, it stays on the same size for 20-30min, then jump up by 90-100KB