Track vulnerabilities like this one.
Sign up free to get alerted when software you use is affected.
3.3
CVE-2026-96283: Flatpak pulls cannot be stopped by other users
CVE-2026-96283 · published 21 days ago
Summary
Flatpak on Canonical, Debian, and Red Hat Enterprise Linux lets one user cancel another user's download, but the cancellation only hides it from tracking, so the original user cannot stop the download. This can leave unwanted data being transferred and use up bandwidth. Update Flatpak to the latest version or apply the provided patch to fix the cancellation handling.
What to do
- Update debian flatpak to version 1.14.10-1~deb12u2.
- Update debian flatpak to version 1.16.4-1.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Ubuntu:Pro:18.04:LTS | canonical | flatpak | All versions |
| Ubuntu:Pro:20.04:LTS | canonical | flatpak | All versions |
| Ubuntu:Pro:22.04:LTS | canonical | flatpak | All versions |
| Ubuntu:Pro:24.04:LTS | canonical | flatpak | All versions |
| Debian:12 | debian | flatpak |
< 1.14.10-1~deb12u2 Fix: upgrade to 1.14.10-1~deb12u2
|
| Debian:13 | debian | flatpak |
< 1.16.4-1 Fix: upgrade to 1.16.4-1
|
| – | red hat | red hat enterprise linux 10 | All versions |
| – | red hat | red hat enterprise linux 7 | All versions |
| – | red hat | red hat enterprise linux 8 | All versions |
| – | red hat | red hat enterprise linux 9 | All versions |
Original advisory text
Flatpak: flatpak: flatpak-system-helper cross-user cancelpull orphans another user's ongoing pull
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.
References
- https://ubuntu.com/security/CVE-2026-96283 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2026-96283 Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2026-96283
- https://bugzilla.redhat.com/show_bug.cgi?id=2539424
- https://security-tracker.debian.org/tracker/CVE-2026-96283 Vendor Advisory
- https://github.com/flatpak/flatpak/security/advisories/GHSA-89xm-3m96-w3jg
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker partial control
Severity
3.3
Low
Type
CWE-862Missing Authorization
Timeline
Published27 Sep 2026
Updated15 Oct 2026
First seen24 Sep 2026
Sources
UBUNTU-CVE-2026-96283 · OSV
CVE-2026-96283 · NVD
CVE-2026-96283 · MITRE
DEBIAN-CVE-2026-96283 · OSV
Track software like this
Free during beta