Bug#1142717: glib2.0: CVE-2026-16118

[Salvatore Bonaccorso]

Source: glib2.0
Version: 2.88.2-1
Severity: important
Tags: security upstream
Forwarded: https://gitlab.gnome.org/GNOME/glib/-/work_items/3992
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for glib2.0.

CVE-2026-16118[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-16118
    https://www.cve.org/CVERecord?id=CVE-2026-16118
[1] https://gitlab.gnome.org/GNOME/glib/-/work_items/3992

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore