Sebastian Wick
f9f16a3e53
The export directory cleanup during deploy used flatpak_rm_rf which wraps glnx_shutil_rm_rf_at(AT_FDCWD, path). The kernel resolves intermediate symlinks in the path, so a malicious ostree commit with "export" as a symlink causes flatpak_rm_rf(export/bin) to delete files at the symlink target. On system installs (running as root), this is arbitrary file deletion. This commit uses fd-based operations to prevent to prevent the symlink attack. Resolves: CVE-2026-97023 Resolves: https://github.com/flatpak/flatpak/security/advisories/GHSA-5p67-xh8x-rq54
Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.
See https://flatpak.org/ for more information.
Flatpak is available in the package repositories of most Linux distributions and can be installed from there. See https://flatpak.org/setup/ for quick setup instructions for many distributions.
Community discussion happens in #flatpak:matrix.org, on the mailing list, and on the Flathub Discourse.
Read documentation for Flatpak here.
Contributing
Flatpak welcomes contributions from anyone! Here are some ways you can help:
- Fix one of the issues and submit a PR
- Update flatpak's translations
- Improve flatpak's documentation, hosted at http://docs.flatpak.org and developed over in flatpak-docs
- Find a bug and submit a detailed report including your OS, flatpak version, and the steps to reproduce
- Add your favorite application to Flathub by writing a flatpak-builder manifest and submitting it
- Improve the Flatpak support in your favorite Linux distribution
Hacking
See CONTRIBUTING.md
Related Projects
Here are some notable projects in the Flatpak ecosystem:
- Flatseal: An app for managing permissions of Flatpak apps without using the CLI
- Flat-manager: A tool for managing Flatpak repositories
Host Requirements
Flatpak aims to run on a wide variety of systems. It is therefore conservative with required dependency versions and kernel features.
Currently, the main branch requires at least kernel version 5.8 (for
statx STATX_MNT_ID).