/usr/lib/x86_64-linux-gnu/libCGAL_ImageIO.so is in libcgal-dev 4.11-2build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libCGAL_ImageIO.so.13
/usr/lib/x86_64-linux-gnu/libCGAL_ImageIO.so.13