Path traversal in Flatpak - #VU141404
Published: August 11, 2026
Vulnerability identifier: #VU141404
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to mount extension content at unintended locations inside the sandbox.
The vulnerability exists due to path traversal in extension metadata fields when processing extension metadata. A remote user can supply absolute paths or .. components in metadata fields to mount extension content at unintended locations inside the sandbox.
Metadata fields involved include directory, subdir_suffix, add_ld_path, and merge_dirs, and exploitation can potentially override runtime directories.
Affected software
Flatpak
Remediation
Install security update from vendor's website.
Flatpak - update to 1.18.1