| Name | CVE-2026-96281 |
| Description | On a multi-user system, a user with an active local login session could downgrade a system-wide Flatpak app to an older version by removing the app's remote ref via the unprivileged system-helper RemoveLocalRef method, causing the anti-downgrade check to fail to find a reference date. A malicious local user could use this to expose other users of the same system to an app version with unfixed vulnerabilities. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-6432-1 |
| Debian Bugs | 1144130 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| flatpak (PTS) | bookworm, bookworm (security) | 1.14.10-1~deb12u2 | vulnerable |
| trixie | 1.16.6-1~deb13u2 | fixed | |
| trixie (security) | 1.16.6-1~deb13u3 | fixed | |
| forky, sid | 1.18.4-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| flatpak | source | trixie | 1.16.6-1~deb13u2 | DSA-6432-1 | ||
| flatpak | source | (unstable) | 1.18.1-1 | 1144130 |
https://github.com/flatpak/flatpak/security/advisories/GHSA-q4gr-vc25-57m5
Fixed by: https://github.com/flatpak/flatpak/commit/d5939b0f1751df7dede31a1ee7fb5b8dfe49fd79 (1.18.1)
Fixed by: https://github.com/flatpak/flatpak/commit/9b990351898b18b48bf4e834bcbc618d270cf8b1 (1.18.1)
Fixed by: https://github.com/flatpak/flatpak/commit/85f241ef6b3784257f0278c4dfbd988355921862 (branch flatpak-1.16.x)
Fixed by: https://github.com/flatpak/flatpak/commit/b0f1704b34d2a551c0073a9fc5e918174a97af64 (branch flatpak-1.16.x)