CVE-2026-96276

CVSS 9.8 (critical) · published 2026-09-23

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.

Weakness: CWE-22

Source: NVD CVE-2026-96276

References

• https://access.redhat.com/security/cve/CVE-2026-96276
• https://bugzilla.redhat.com/show_bug.cgi?id=2539418
• https://github.com/flatpak/flatpak/security/advisories/GHSA-8qxj-x646-phcm

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