Bug 2542917

Summary: CVE-2026-97027 flatpak: flatpak: Denial of service via unsanitized keys in exported Desktop Entry / D-Bus Service files [fedora-all]
Product: [Fedora] Fedora Reporter: Melissa Ing <meing>
Component: flatpakAssignee: David King <amigadave>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: low Docs Contact:
Priority: unspecified    
Version: rawhideCC: amigadave, debarshir, gnome-sig, kalevlember, renner0
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["f843a5bb-9e80-46a7-a32e-b157503df216"]}
Fixed In Version: flatpak-1.18.4-1.fc44 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-10-04 01:42:18 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Melissa Ing 2026-09-29 03:12:15 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

GHSA-v64f-hrwr-j4vh (https://github.com/flatpak/flatpak/security/advisories/GHSA-v64f-hrwr-j4vh)

Description: A malicious Flatpak application can influence host system behavior beyond its sandbox by including arbitrary keys in its exported Desktop Entry (.desktop) or D-Bus Service (.service) files. This can lead to denial of service (e.g. X-GNOME-AutoRestart causing unconditional application restarts) or unintended interaction with host services (e.g. SystemdService directing the D-Bus daemon to activate a host systemd unit instead of the sandboxed wrapper). When Flatpak exports these files, it rewrites Exec= to go through the flatpak run wrapper and removes a small denylist of known-dangerous keys, but passes all other keys through unmodified. The fix switches from a denylist to an allowlist, exporting only keys from a curated list of known-safe entries.

Mitigation: Only install applications from trusted sources. Patched in 1.18.4 by commit 33931025 ("dir: Validate Desktop Entry and D-Bus Service"). Credit: Reported by Markus Göllnitz.
Comment 1 Fedora Update System 2026-09-30 08:13:51 UTC 
FEDORA-2026-7a31054ed6 (flatpak-1.18.4-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-7a31054ed6
Comment 2 Fedora Update System 2026-10-01 02:00:55 UTC 
FEDORA-2026-7a31054ed6 has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-7a31054ed6`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-7a31054ed6

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 3 Fedora Update System 2026-10-04 01:42:18 UTC 
FEDORA-2026-7a31054ed6 (flatpak-1.18.4-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.