Bug 2529702 (CVE-2026-74859)

Summary:	CVE-2026-74859 gnome-tweaks: path traversal in theme installer
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	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.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2529707, 2529708
Bug Blocks:

Description OSIDB Bzimport 2026-09-08 07:43:17 UTC

Summary: Path traversal in theme installer
Requirements to exploit: user installs malicious gnome-shell theme
Component affected: ShellThemeInstallerTweak
Version affected: All versions
Patch available: Yes
Version fixed (if any already): Not yet
Upstream coordination: See issue report (below)
CVSS (optional):
Impact (optional):
Embargo: No
Acknowledgment: Zach Sylvester
Steps to reproduce if available: see issue report
Mitigation if available: do not use gnome-tweaks to install gnome-shell themes
Original report: https://gitlab.gnome.org/GNOME/gnome-tweaks/-/issues/542