Description
A malicious Flatpak extension can probe the host filesystem to determine what files and directories exist at arbitrary paths, and host directory listings can be disclosed to sandboxed applications using the extension. Additionally, unvalidated extension metadata can cause extension content to be mounted at unintended locations inside the sandbox.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | flatpak | 1.18.1-1 | — |
| Debian 13 | flatpak | 1.16.6-1~deb13u2 | — |
| Debian 12 | flatpak | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | flatpak | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | flatpak | No fix yet | — |
| Ubuntu Pro 22.04 LTS | flatpak | No fix yet | — |
| Ubuntu Pro 20.04 LTS | flatpak | No fix yet | — |
| Ubuntu Pro 18.04 LTS | flatpak | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | flatpak | 1.16.6-150600.3.12.1 | SUSE-SU-2026:4944-1 |
| SLES 15 SP6 | flatpak | 1.16.6-150600.3.12.1 | SUSE-SU-2026:4944-1 |
| SLES 15 SP5 | flatpak | 1.16.6-150500.3.21.1 | SUSE-SU-2026:5127-1 |
| SLES 12 SP5 | flatpak | 1.4.2-3.15.1 | SUSE-SU-2026:4610-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | flatpak | 1.16.6-150600.3.12.1 | SUSE-SU-2026:4944-1 |
| SLES for SAP 15 SP5 | flatpak | 1.16.6-150500.3.21.1 | SUSE-SU-2026:5127-1 |
| SLE HPC 15 SP5 | flatpak | 1.16.6-150500.3.21.1 | SUSE-SU-2026:5127-1 |
Advisories 3
- SUSE-SU-2026:5127-1 Security update for flatpak SUSE / openSUSE Security Updates · Nov 7, 2026
- SUSE-SU-2026:4944-1 Security update for flatpak SUSE / openSUSE Security Updates · Oct 31, 2026
- SUSE-SU-2026:4610-1 Security update for flatpak SUSE / openSUSE Security Updates · Oct 10, 2026