gpg-key2ps in signing-party 1.1.x and 2.x before 2.10-1 contains an unsafe shell call enabling shell injection via a User ID.
https://lists.debian.org/debian-lts-announce/2019/05/msg00001.html
https://bugs.debian.org/928256
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00029.html