/usr/lib/libxmlsec1.so is in libxmlsec1-dev 1.2.14-1.2build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libxmlsec1.so.1.2.14
/usr/lib/libxmlsec1.so.1.2.14