plugins/gtk+/glade-gtk-box.c in GNOME Glade before 3.38.1 and 3.39.x before 3.40.0 mishandles widget rebuilding for GladeGtkBox, leading to a denial of service (application crash). CREATE(Triage):(User=admin) CVE-2020-36774 (https://nvd.nist.gov/vuln/detail/CVE-2020-36774)