exif_entry_get_value in exif-entry.c in libexif 0.6.21 has a divide-by-zero error.
https://usn.ubuntu.com/4358-1/
https://security.gentoo.org/glsa/202007-05
https://lists.debian.org/debian-lts-announce/2020/05/msg00016.html
https://github.com/libexif/libexif/issues/31
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00017.html