This page tracks the Ubuntu fix status. The vulnerability itself is described on the main CVE page.
View CVE-2026-96276 →
UBUNTU-CVE-2026-96276
If a malicious SDK container declares an extension point with a crafted `directory` path, and a developer runs `flatpak build-init --writable-sdk --sd...
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) OSV
Affected packages
Ubuntu:Pro:18.04:LTS
flatpak
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:20.04:LTS
flatpak
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:22.04:LTS
flatpak
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:Pro:24.04:LTS
flatpak
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.04:LTS
flatpak
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
References
- report ubuntu.com
- report cve.org
- report github.com