squashfs-tools is vulnerable to Directory Traversal. It is a different vulnerability than CVE-2021-40153. A squashfs filesystem that has been crafted to include a symbolic link and then contents under the same filename in a filesystem can cause unsquashfs to first create the symbolic link pointing outside the expected directory, and then the subsequent write operation will cause the unsquashfs process to write through the symbolic link elsewhere in the filesystem.
git://git.launchpad.net/ubuntu-cve-tracker/tree/active/CVE-2021-41072
github.com/plougher/squashfs-tools/commit/e0485802ec72996c20026da320650d8362f555bd
github.com/plougher/squashfs-tools/issues/72#issuecomment-913833405
lists.debian.org/debian-lts-announce/2021/10/msg00017.html
www.debian.org/security/2021/dsa-4987