autoar-extractor.c in GNOME gnome-autoar through 0.2.4, as used by GNOME Shell, Nautilus, and other software, allows Directory Traversal during extraction because it lacks a check of whether a file's parent is a symlink to a directory outside of the intended extraction location.
https://security.gentoo.org/glsa/202105-10
https://gitlab.gnome.org/GNOME/gnome-autoar/-/issues/7
https://gitlab.gnome.org/GNOME/gnome-autoar/-/commit/adb067e645732fdbe7103516e506d09eb6a54429