CVE-2026-96283
Description
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.
Statement
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).
Mitigation
No known mitigation other than updating.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 3.3 | N/A | 3.3 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | Low | N/A | Low |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Acknowledgements
Upstream acknowledges Asim Viladi Oglu Manizada as the original reporter.
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