This seems to affect only paint 11.0.0.0 up to, but not including, 11.2605.91.0. For folks like me, running a much older version, its probably safe, although its Windows so, I'm not too sure.
This was my observation too; I assume 11.0.0.0 is windows 11? because my windows 10 mspaint doesn't even match that numbering format.
My version shows "22H2" I don't know if I'm vulnerable or not
I'm amazed MS Paint is somehow up to version 11, let alone 11.2605 (!). I literally can't remember the last time I used it, but what are they even changing?