ephy-session.c in libephymain.so in GNOME Web (aka Epiphany) through 3.28.2.1 allows remote attackers to cause a denial of service (application crash) via JavaScript code that triggers access to a NULL URL, as demonstrated by a crafted window.open call.
https://bugzilla.gnome.org/show_bug.cgi?id=795740
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00043.html