CVE-2026-96276 [CRITICAL] – If a malicious SDK container declares an extension point with a crafted `directory` path,

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.