/usr/lib/x86_64-linux-gnu/libexslt.so is in libxslt1-dev 1.1.29-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libexslt.so.0.8.17
/usr/lib/x86_64-linux-gnu/libexslt.so.0.8.17