A flaw was found in the hivex library. This flaw allows an attacker to input a specially crafted Windows Registry (hive) file, which would cause hivex to recursively call the _get_children() function, leading to a stack overflow. The highest threat from this vulnerability is to system availability.
https://listman.redhat.com/archives/libguestfs/2021-August/msg00002.html
https://github.com/libguestfs/hivex/commit/771728218dac2fbf6997a7e53225e75a4c6b7255