No matter what the cause, you don't want a mess in the oven (or loss of good cake) each time you bake banana bread.
Use larger pans and/or fill the current ones no more than 2/3 full.
This leaves space for cake to expand during baking without overflowing.
Normally that would make the batter not rise enough, not overflow! If you've made the recipe before without problems, check your measurements and pan size. If both times you've made it it's overflowed, try another recipe and see if that also overflows.
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Use larger pans and/or fill the current ones no more than 2/3 full.
This leaves space for cake to expand during baking without overflowing.