Comment by Juerd

Very simple script to check which PNG files have trailing data: https://gist.github.com/Juerd/40071ec6d1da9d4610eba4417c8672...

I hope that people who host forums, image boards, chat applications, etc., will delete or fix potentially vulnerable images before anyone uses them maliciously.

One way to repair a vulnerable image is to use `optipng -fix`.