CVE-2026-96283

By calling org.freedesktop.Flatpak.SystemHelper.CancelPull on another user's pull, the pull is not actually cancelled but removed from internal tracking, making it impossible for the owning user to stop it. Ongoing pulls cannot be stopped.

Red Hat estimates the CVSSv3.1 vector of CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

Exploitation requires the attacker to be a local, authenticated user on the same multi-user system as the victim, able to reach the org.freedesktop.Flatpak.SystemHelper D-Bus service (AV:L, PR:L). Calling CancelPull on a pull ID belonging to another user removes that pull from the system-helper's internal tracking rather than actually cancelling it, and this requires no special preconditions beyond knowing/targeting another user's active pull, and no interaction from the victim (AC:L, UI:N). The effect stays confined to the flatpak subsystem's own bookkeeping (S:U). No data is disclosed or altered (C:N/I:N). The impact is a narrow availability effect: the targeted pull operation becomes untrackable and cannot subsequently be cancelled by its owner. This affects one specific in-progress operation rather than the system or service as a whole (A:L).

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

No known mitigation other than updating.