Nothing leapt out at me, but I did notice that Canon had an image processing application called Digital Photo Processing. Well, nothing ventured...etc: I downloaded it (though you have to enter the serial number of your camera to prove you are the owner of a Canon camera), installed it and fired it up.
When I opened one of the raw files exhibiting this severe CA the DPP software fixed it before my eyes automagically! I didn't have to anything except perhaps click on the image or change the White Balance. Your blogger is much relieved.
I shall have to explore what else this software does, but beware, dear reader, it only works on raw files.
I processed the photos in my previous post that were affected by CA, and redisplay them in this post. It was a rather tedious process as I fixed each file individually. I did notice a 'batch' feature which should allow me to process a whole load of files at once.
Hopefully, Canon will get around to issuing a firmware fix of this which I can load into the camera.
For those of you who do not know what Chromatic Aberration is (it took me a number of months to figure it out properly) here is a before and after example. The CA is a little on the severe side, but is fairly representative. Note, I have cropped a tiny area from the photograph. You don't see such wide fringing unless you zoom right into the photo - almost 100% zoom.
The upshot is that I do not have to remember to turn the focus ring 3mm to the left every time I take a landscape scene.