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    CVE-2026-34078

    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.

    Published:Apr 7, 2026
    Last Modified:Apr 24, 2026
    EPS:Apr 7, 2026
    EPSS Score:0.00043
    CVSS Score:10

    Affected Products

    Vendor
    Flatpak
    Product
    Flatpak

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-34079 (CVSS 8.7) — Flatpak is a Linux application sandboxing and distribution framework. Prior to 1.16.4, the caching for ld.so r…
    CVE-2024-42472 (CVSS 10) — Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.14.0 and 1.15.10, a …
    CVE-2024-32462 (CVSS 8.4) — Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. in versio…
    CVE-2023-28100 (CVSS 10) — Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. Versions …
    CVE-2023-28101 (CVSS 5) — Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In versio…
    CVE-2021-43860 (CVSS 8.2) — Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.12.3 and 1.10.6, Fla…
    CVE-2022-21682 (CVSS 7.7) — Flatpak is a Linux application sandboxing and distribution framework. A path traversal vulnerability affects v…
    CVE-2021-41133 (CVSS 8.8) — Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In versio…
    CVE-2021-21381 (CVSS 7.1) — Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In Flatpa…
    CVE-2021-21261 (CVSS 7.3) — Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. A bug was…

    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/errata/RHSA-2026:21755
    https://access.redhat.com/errata/RHSA-2026:21756
    https://access.redhat.com/errata/RHSA-2026:21757
    https://access.redhat.com/errata/RHSA-2026:23417
    https://access.redhat.com/errata/RHSA-2026:23418
    https://access.redhat.com/errata/RHSA-2026:23419
    https://access.redhat.com/errata/RHSA-2026:23420
    https://access.redhat.com/errata/RHSA-2026:25068
    https://access.redhat.com/errata/RHSA-2026:25381
    https://access.redhat.com/errata/RHSA-2026:30901
    https://access.redhat.com/errata/RHSA-2026:35843
    https://access.redhat.com/security/cve/CVE-2026-34078
    https://bugzilla.redhat.com/show_bug.cgi?id=2456276
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34078.json

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High