Path traversal in Flatpak - #VU141405
Published: August 11, 2026
Vulnerability identifier: #VU141405
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/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 attacker to write attacker-controlled content to arbitrary locations on the host filesystem.
The vulnerability exists due to path traversal in extract_extra_data when extracting extra-data from a malicious or compromised Flatpak repository. A remote attacker can provide a repository containing a symlinked files entry to write attacker-controlled content to arbitrary locations on the host filesystem.
On system installs, the write occurs with root permissions.
Affected software
Flatpak
Remediation
Install security update from vendor's website.
Flatpak - update to 1.18.1