CVE-2026-96276

Published: Sep 23, 2026Modified: Nov 6, 2026

9.8

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitability: 3.9 / Impact: 5.9

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

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.

Related CWEs

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

References (3)

https://access.redhat.com/security/cve/CVE-2026-96276

Source: secalert@redhat.com

https://bugzilla.redhat.com/show_bug.cgi?id=2539418

Source: secalert@redhat.com

https://github.com/flatpak/flatpak/security/advisories/GHSA-8qxj-x646-phcm

Source: secalert@redhat.com

Timeline

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