CVE-2026-97026
Fixed in a distro release EPSS <1%CVSS 3.9
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.
Products: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | flatpak | no fix |
| Debian 13 | flatpak | 1.16.6-1~deb13u3 |
| Debian 14 | flatpak | 1.18.4-1 |
| Ubuntu 26.04 LTS | flatpak | no fix |
| Ubuntu 26.10 | flatpak | no fix |
| Ubuntu Pro 18.04 LTS | flatpak | no fix |
| Ubuntu Pro 20.04 LTS | flatpak | no fix |
| Ubuntu Pro 22.04 LTS | flatpak | no fix |
| Ubuntu Pro 24.04 LTS | flatpak | no fix |
| openSUSE Tumbleweed | flatpak | 1.18.4-1.1 |