Bug 2456276 (CVE-2026-34078) - CVE-2026-34078 flatpak: Flatpak: Arbitrary code execution via crafted symlinks in sandbox-expose options
Summary: CVE-2026-34078 flatpak: Flatpak: Arbitrary code execution via crafted symlink...
Keywords:
Status: NEW
Alias: CVE-2026-34078
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2456383 2456384
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-07 22:01 UTC by OSIDB Bzimport
Modified: 2026-04-08 09:03 UTC (History)
0 users

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Description OSIDB Bzimport 2026-04-07 22:01:32 UTC 
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.
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