patch is vulnerable to denial of service (DoS). The vulnerability exists through a double free of memory in pch.c:another_hunk() causes a crash.
www.securityfocus.com/bid/103047
access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.7_release_notes/index
access.redhat.com/errata/RHSA-2019:2033
access.redhat.com/security/updates/classification/#low
bugzilla.redhat.com/show_bug.cgi?id=1626473
bugzilla.redhat.com/show_bug.cgi?id=1653294
savannah.gnu.org/bugs/index.php?53133
security.gentoo.org/glsa/201904-17