Is CVE-2026-74859 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-74859?

CVE-2026-74859 has a CVSS v3 severity of MEDIUM (6.8).

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CVE-2026-74859

Description

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.