flatpak: Flatpak creates temporary child repository directories under the user cache with world-writable permissions (0777)
CVE-2026-97026 is fixed in flatpak on 1 platform, first by DEBIAN-CVE-2026-97026, released September 29, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Flatpak creates temporary child repository directories under the user cache with world-writable permissions (0777). On multi-user systems with a permissive umask, other local users could read or modify the temporary directory used while installing apps or runtimes, potentially causing installation failures (denial of service); tampered content would fail signature/digest verification rather than being trusted.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| flatpak · Debian 13.5 (trixie) | 1.16.6-1~deb13u3 | DEBIAN-CVE-2026-97026 | Sep 29, 2026 |
| flatpak · Debian 14 | 1.18.4-1 | DEBIAN-CVE-2026-97026 | Sep 29, 2026 |
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