CVE-2026-34078
Flatpak has a complete sandbox escape leading to host file access and code execution in the host context
- State
- Published
- Severity
- 9.3 Critical
- Published
- Apr 7, 2026
- Updated
- Jul 15, 2026
- Reserved
- Mar 25, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | GitHub_M |
| 3.1 | 9.0 Critical | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
flatpakflatpak |
|
References
- https://github.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprg
- http://www.openwall.com/lists/oss-security/2026/04/09/8
- http://www.openwall.com/lists/oss-security/2026/04/10/14
- https://access.redhat.com/security/cve/CVE-2026-34078vdb-entry
- RHBZ#2456276issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34078.json
- https://access.redhat.com/errata/RHSA-2026:35843vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:23420vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:21757vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:21756vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:30901vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:25381vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:25068vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:23419vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:23417vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:23418vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:21755vendor-advisory
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