#VU125296 Improper access control in Flatpak - CVE-2026-34078
Published: April 8, 2026
Vulnerability identifier: #VU125296
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-34078
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Flatpak
Flatpak
Software vendor:
Flatpak
Flatpak
Description
The vulnerability allows a remote attacker to execute code in the host context.
The vulnerability exists due to improper access control in the Flatpak portal and flatpak run when processing sandbox-expose options containing app-controlled symlinks. A remote attacker can supply a crafted path to gain access to arbitrary host files and execute code in the host context.
The issue enables sandbox escape from a Flatpak app to the host environment.
Remediation
Install security update from vendor's website.