flatpak: If a malicious SDK container declares an extension point with a crafted `directory` path, and a developer runs `flatp...
CVE-2026-96276 is fixed in flatpak on 1 platform, first by DEBIAN-CVE-2026-96276, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.
If a malicious SDK container declares an extension point with a crafted `directory` path, and a developer runs `flatpak build-init --writable-sdk --sdk-extension` with that SDK, attacker-chosen files could be written outside the working directory, since the target path is resolved via a function that allows `..` traversal.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| flatpak · Debian 13.5 (trixie) | 1.16.6-1~deb13u2 | DEBIAN-CVE-2026-96276 | Sep 23, 2026 |
| flatpak · Debian 14 | 1.18.1-1 | DEBIAN-CVE-2026-96276 | Sep 23, 2026 |
| flatpak · sles 15.6 | 1.16.6-150600.3.12.1 | SUSE-SU-2026:4944-1 | Nov 7, 2026 |
| flatpak · sles 15.7 | 1.16.6-150600.3.12.1 | SUSE-SU-2026:4944-1 | Nov 7, 2026 |
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