Critical severity10.0NVD Advisory· Published Apr 7, 2026· Updated Apr 24, 2026
CVE-2026-34078
CVE-2026-34078
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.
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
3- www.openwall.com/lists/oss-security/2026/04/09/8nvdThird Party AdvisoryMailing List
- www.openwall.com/lists/oss-security/2026/04/10/14nvdMailing ListThird Party Advisory
- github.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprgnvdVendor Advisory
News mentions
1- Attackers replaced JDownloader installer downloads with malwareMalwarebytes Labs · May 15, 2026