Apple is recalling specific EU 5W iPhone adapters due to possible overheating issues. The model in question is the A1300 pictured below.
Here is what Apple had to say:
“Apple has determined that, in rare cases, the Apple 5W European USB power adapter may overheat and pose a safety risk,” stated Apple on the company’s website. “We have voluntarily decided to exchange every affected power adapter for a new, redesigned adapter, free of charge.”
You can find the exchange program details here.