Ubuntu Flatpak File Access Deletion Issues CVE-2026-34078 CVE-2026

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Flatpak could be made to access files outside its sandbox or delete arbitrary files on the host. Software Description: - flatpak: Application deployment framework for desktop apps Details: It was discovered that Flatpak did not properly validate paths in sandbox-expose options. A malicious or compromised Flatpak app could use app-controlled symlinks to access arbitrary host files and gain code execution in the host context. This issue was addressed in Ubuntu Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-34078) It was discovered that Flatpak did not properly validate paths when removing outdated ld.so cache files. A malicious or compromised Flatpak app could use this issue to delete arbitrary files on the host. (CVE-2026-34079)

Flatpak could be made to access files outside its sandbox or delete

arbitrary files on the host.

Software Description:

- flatpak: Application deployment framework for desktop apps

It was discovered that Flatpak did not properly validate paths in

sandbox-expose options. A malicious or compromised Flatpak app could

use app-controlled symlinks to access arbitrary host files and gain

code execution in the host context. This issue was addressed in Ubuntu

Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-34078)

It was discovered that Flatpak did not properly validate paths when

removing outdated ld.so cache files. A malicious or compromised Flatpak

app could use this issue to delete arbitrary files on the host.

The problem can be corrected by updating your system to the following package versions: Ubuntu 24.04 LTS flatpak 1.14.6-1ubuntu0.1+esm1 Available with Ubuntu Pro libflatpak0 1.14.6-1ubuntu0.1+esm1 Available with Ubuntu Pro Ubuntu 22.04 LTS flatpak 1.12.7-1ubuntu0.1+esm1 Available with Ubuntu Pro libflatpak0 1.12.7-1ubuntu0.1+esm1 Available with Ubuntu Pro Ubuntu 20.04 LTS flatpak 1.6.5-0ubuntu0.5+esm1 Available with Ubuntu Pro libflatpak0 1.6.5-0ubuntu0.5+esm1 Available with Ubuntu Pro Ubuntu 18.04 LTS flatpak 1.0.9-0ubuntu0.4+esm1 Available with Ubuntu Pro libflatpak0 1.0.9-0ubuntu0.4+esm1 Available with Ubuntu Pro In general, a standard system update will make all the necessary changes.

CVE-2026-34078, CVE-2026-34079

Ubuntu Security Notice USN-8741-1

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