do_ed_script in pch.c in GNU patch through 2.7.6 does not block strings beginning with a ! character. NOTE: this is the same commit as for CVE-2019-13638, but the ! syntax is specific to ed, and is unrelated to a shell metacharacter.
packetstormsecurity.com/files/154124/GNU-patch-Command-Injection-Directory-Traversal.html
access.redhat.com/errata/RHSA-2019:2798
access.redhat.com/errata/RHSA-2019:2964
access.redhat.com/errata/RHSA-2019:3757
access.redhat.com/errata/RHSA-2019:3758
access.redhat.com/errata/RHSA-2019:4061
git.savannah.gnu.org/cgit/patch.git/commit/?id=3fcd042d26d70856e826a42b5f93dc4854d80bf0
github.com/irsl/gnu-patch-vulnerabilities
seclists.org/bugtraq/2019/Aug/29