CVE-2026-34078 — Flatpak has a complete sandbox escape leading to host file access and code execution in the host context
Flatpak is a Linux application sandboxing and distribution framework. Prior to 1.16.4, the Flatpak portal accepts paths in the sandbox-expose options which can be app-controlled…
Published: 2026-04-07 · CVSS: 9.3 · CVSS 4.0
Flatpak is a Linux application sandboxing and distribution framework. Prior to 1.16.4, the Flatpak portal accepts paths in the sandbox-expose options which can be app-controlled symlinks pointing at arbitrary paths. Flatpak run mounts the resolved host path in the sandbox. This gives apps access to all host files and can be used as a primitive to gain code execution in the host context. This vulnerability is fixed in 1.16.4.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7