Two more fixes have just landed in GLib main and glib-2-74, and the 2.75.1 (unstable) and 2.74.4 (stable) releases have just been made.
The two new fixes are for bugs found by oss-fuzz after the original fixes (above) landed. One of them is a heap buffer overflow which was introduced by one of the previous fixes, so it is important that these new fixes are applied if your distribution has backported the previous fixes. Shipping 2.74.4 or 2.75.1 will be sufficient.
The new fixes are: