CVE-2026-34078
Flatpak has a complete sandbox escape leading to host file access and code execution in the host context
CVSS Score
9.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-61 |
| Vendor | flatpak |
| Product | flatpak |
| Published | Apr 7, 2026 |
| Last Updated | Jul 15, 2026 |
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Affected Versions
flatpak / flatpak
< 1.16.4
References
github.com: https://github.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprg openwall.com: http://www.openwall.com/lists/oss-security/2026/04/09/8 openwall.com: http://www.openwall.com/lists/oss-security/2026/04/10/14 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-34078 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2456276 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34078.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:35843 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:23420 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:21757 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:21756 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:30901 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:25381 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:25068 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:23419 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:23417 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:23418 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:21755