Vulnerability Description
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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Flatpak | Flatpak | <= 1.16.3 |
Related Weaknesses (CWE)
References
- https://github.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprgVendor Advisory
- http://www.openwall.com/lists/oss-security/2026/04/09/8Third Party AdvisoryMailing List
- http://www.openwall.com/lists/oss-security/2026/04/10/14Mailing ListThird Party Advisory
FAQ
What is CVE-2026-34078?
CVE-2026-34078 is a vulnerability with a CVSS score of 10.0 (CRITICAL). 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 a...
How severe is CVE-2026-34078?
CVE-2026-34078 has been rated CRITICAL with a CVSS base score of 10.0/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-34078?
Check the references section above for vendor advisories and patch information. Affected products include: Flatpak Flatpak.