Yes. There was a post today where the user actually vaporized one of the regulator pins.
Use an external regulator (such as LM317) and bring the input voltage down to 7.5V.
While yes, any arduino clone, anything over 9v will usually fry the regulator, the official one supports 12v just fine, the cheap ones (cloned with cheap parts) don't they get so hot and let the current through that in turn gives 9v+ to the poor microprocessor.
however.Can my Arduino burn up if my voltage regulator overheats?
depends what the voltage regulator it is..... that should answer the question properly, i can't imagine a lm317 doing anything but reducing the current if there's a short or overload.