https://seclists.org/oss-sec/2026/q2/56: 4 security fixes in Flatpak, including critical CVE-2026-34078: Complete sandbox escape leading to host file access and code execution in the host context

Published Apr 9, 2026
·
Updated

Affected Software

1 affected component
Flatpak Flatpak<1.16.4
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Frequently Asked Questions

1

What is the severity of CVE-2026-34078?

CVE-2026-34078 has been classified as a critical severity vulnerability.

2

What does CVE-2026-34078 exploit?

CVE-2026-34078 is a complete sandbox escape vulnerability that allows unauthorized access to host files and code execution in the host context.

3

How do I fix CVE-2026-34078?

To mitigate CVE-2026-34078, update to Flatpak version 1.16.4 or 1.17.4.

4

What versions of Flatpak include the fix for CVE-2026-34078?

Flatpak versions 1.16.4 and 1.17.4 include the security fix for CVE-2026-34078.

5

Are there any known regressions caused by the fixes for CVE-2026-34078?

Yes, Flatpak versions 1.16.5 and 1.17.5 were released to address regressions caused by the critical security fix.

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