iPhone is overheating while using Safari after iOS 18.4.1 update

That is bad! I would report it here ➡️Product Feedback - Apple

Hello~ Click on below…

If the battery in your iPhone drains too quickly - Apple Support

Are you receiving a temp warning?

If your iPhone or iPad gets too hot or too cold - Apple Support

Also…

Force restart iPhone - Apple Support

~Katana-San~

Kelo17 (Author)

Perhaps if you've recently updated your iPhone, there

likely is a period of time expected where the unit may

run warm or feel very hot at times, as the processors

update the iPhone systems and organize files, etc.

A few weeks may be required duration for this adjustment.

Settings for Safari and other bits, may need checked, and

reset, to affect power consumption, & heat generation.

Contact the store or Apple authorized service about this

situation, as they may have advice about any settings

that you could make; in the meantime hold it carefully.