CVE-2026-16118

A flaw was found in xdgmime. A heap-based buffer overflow can be triggered in _xdg_mime_magic_parse_magic_line() in the xdgmimemagic.c file on little-endian systems when an attacker-controlled MIME magic file in a user-writable XDG data location (e.g., in the $XDG_DATA_HOME/mime/magic path) is parsed by an application performing MIME type detection (e.g., via g_content_type_guess()). When performing byte-swap, incorrect pointer arithmetic on the write side causes an out-of-bounds write of 2 bytes, resulting in an application crash or memory corruption.

• glib2.0 https://gitlab.gnome.org/GNOME/glib/-/work_items/3992 https://bugzilla.redhat.com/show_bug.cgi?id=2501732 https://gitlab.freedesktop.org/xdg/xdgmime/-/work_items/41