A flaw was found in Flatpak. A Time-of-check to time-of-use (TOCTOU) race condition exists in the `org.freedesktop.Flatpak.SystemHelper` component. This vulnerability occurs because a privileged `chmod` operation executes before the OSTree repository validation within the `Deploy()` function. An attacker can exploit this timing window to redirect symlinks to arbitrary files, potentially leading to unauthorized file manipulation or information disclosure.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade flatpak-debugsourceUpgrade flatpak-session-helperUpgrade flatpakUpgrade flatpak-selinuxUpgrade flatpak-debuginfoUpgrade flatpak-testsUpgrade flatpak-tests-debuginfoUpgrade flatpak-develUpgrade flatpak-libs-debuginfoUpgrade flatpak-libsUpgrade flatpak-session-helper-debuginfo | Sep 30, 2026 | Sep 4, 2026 |
| Redhat_linux | — | No solution exists | Sep 7, 2026 | Aug 19, 2026 |
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