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ALSA-2026:21755 — Important: flatpak security update

Affected: AlmaLinux:9: flatpak, AlmaLinux:9: flatpak-devel, AlmaLinux:9: flatpak-libs, AlmaLinux:9: flatpak-selinux, AlmaLinux:9: flatpak-session-helper

Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.

Security Fix(es):

* flatpak: Flatpak: Arbitrary code execution via crafted symlinks in sandbox-expose options (CVE-2026-34078) * flatpak: Flatpak: Arbitrary file deletion on host via improper cache file path validation (CVE-2026-34079)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

bdu:2026-05831

EUVD-2026-337319

fkie_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.

OESA-2026-2590 — flatpak security update

Affected: openEuler:24.03-LTS-SP1: flatpak

flatpak is a system for building, distributing and running sandboxed desktop applications on Linux. See https://wiki.gnome.org/Projects/SandboxedApps for more information. Security Fix(es):

Every Flatpak app is able to read and write arbitrary files on the host and execute code in the host context, resulting in a sandbox escape vulnerability.(CVE-2026-34078)

Flatpak is a Linux application sandboxing and distribution framework. Prior to 1.16.4, the caching for ld.so removes outdated cache files without properly checking that the app controlled path to the outdated cache is in the cache directory. This allows Flatpak apps to delete arbitrary files on the host. This vulnerability is fixed in 1.16.4.(CVE-2026-34079)

openSUSE-SU-2026:10541-1 — flatpak-1.16.6-1.1 on GA media

flatpak-1.16.6-1.1 on GA media

RHSA-2026:23417 — Red Hat Security Advisory: flatpak security update

flatpak: Flatpak: Arbitrary code execution via crafted symlinks in sandbox-expose options flatpak: Flatpak: Arbitrary file deletion on host via improper cache file path validation

RLSA-2026:21755 — Important: flatpak security update

Affected: Rocky Linux:9: flatpak

Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.

Security Fix(es):

* flatpak: Flatpak: Arbitrary code execution via crafted symlinks in sandbox-expose options (CVE-2026-34078)

* flatpak: Flatpak: Arbitrary file deletion on host via improper cache file path validation (CVE-2026-34079)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

SUSE-SU-2026:1541-1 — Security update for flatpak

Security update for flatpak

UBUNTU-CVE-2026-34078

Affected: Ubuntu:Pro:18.04:LTS: flatpak, Ubuntu:Pro:20.04:LTS: flatpak, Ubuntu:Pro:22.04:LTS: flatpak, Ubuntu:Pro:24.04:LTS: flatpak, Ubuntu:25.10: flatpak

WID-SEC-W-2026-1732 — Red Hat Enterprise Linux (Flatpak): Mehrere Schwachstellen

Ein authentisierter Angreifer kann mehrere Schwachstellen im Flatpak Paket von Red Hat Enterprise Linux ausnutzen, um beliebigen Programmcode auszuführen und um Dateien zu löschen.