huft_build in archival/libarchive/decompress_gunzip.c in BusyBox before 1.27.2 misuses a pointer, causing segfaults and an application crash during an unzip operation on a specially crafted ZIP file.
https://usn.ubuntu.com/3935-1/
https://lists.debian.org/debian-lts-announce/2021/02/msg00020.html
https://lists.debian.org/debian-lts-announce/2018/07/msg00037.html
https://git.busybox.net/busybox/commit/?id=1de25a6e87e0e627aa34298105a3d17c60a1f44e