Bug#1147509: gnome-tweaks: CVE-2026-74859

[Salvatore Bonaccorso]

Source: gnome-tweaks
Version: 49.0-1
Severity: important
Tags: security upstream
Forwarded: https://gitlab.gnome.org/GNOME/gnome-tweaks/-/issues/542
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for gnome-tweaks.

Mainly filling for tracking to the upstream project issue.

CVE-2026-74859[0]:
| The shell theme installer in gnome-tweaks extracts user-supplied ZIP
| archives without validating archive member paths. As a result, a
| crafted theme archive can write files outside ~/.themes by using ../
| path traversal, absolute paths, or symlink entries.


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-2026-74859
    https://www.cve.org/CVERecord?id=CVE-2026-74859
[1] https://gitlab.gnome.org/GNOME/gnome-tweaks/-/issues/542

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore