CVE-2026-34078
Flatpak has a complete sandbox escape leading to host file access and code execution in the host context
CVSS Score
0.0
EPSS Score
0.2%
EPSS Percentile
36th
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.
| CWE | CWE-61 |
| Vendor | flatpak |
| Product | flatpak |
| Published | Apr 7, 2026 |
| Last Updated | Apr 11, 2026 |
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Affected Versions
flatpak / flatpak
< 1.16.4