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This is a prime example of why I don't drive any of my nice cars in the winter up here. It's not even because of the snow or the icy conditions, it's the salt they dump. Quebec is one of the only provinces that continues to use salt instead of sand during the winter. There was even another member here from Quebec who's rear subframe was so rusted out from the winter salt that his diff just fell out as he was pulling away.
Nothing for you to worry about if you car is CPO. Just bring it to them and they'll replace it under warranty for you. If you end up driving your car next winter, I would suggest hosing down the wheel wells and underbody in your garage as often as you can. It won't get rid of all the salt, but it'll definitely help.
Of course I don't know if you car was winter driven. Maybe you just have a defective exhaust. Road salt will definitely speed up corrosion, though.
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