Bug 2543195

Summary: CVE-2026-97024 flatpak: flatpak: Arbitrary write in root context via path traversal in deploy directory files/etc [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: high 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": ["40f4496d-1959-4a94-9e4d-062256efcdda"]}
Fixed In Version: flatpak-1.18.4-1.fc44 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-10-04 01:42:21 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 13:28:26 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-8xgq-v545-vgvf (https://github.com/flatpak/flatpak/security/advisories/GHSA-8xgq-v545-vgvf)

Description: A path traversal vulnerability during app installation could be used by an attacker to overwrite system files. A malicious Flatpak app could arrange for files named "passwd", "group", or "machine-id" on the host system (e.g. /etc/passwd) to be emptied when the app is upgraded, resulting in data loss and loss of access to the system. When installing Flatpak apps system-wide, the file write is done by root. It is not believed to be possible to replace these files with attacker-chosen content. Similarly, a malicious app could arrange for files named "resolv.conf" to be replaced by a symbolic link to /run/host/monitor/resolv.conf, which is unlikely to exist on the host system.

Mitigation: No known mitigation other than updating. Patched in 1.18.4 by commits 01cd7c4b ("dir: Add fd-relative helpers for accessing deploy directories") and cc3ab6ab ("dir: Use fd-relative operations for files/etc during runtime deploy"). The changes overlap with those for GHSA-5p67-xh8x-rq54 (CVE-2026-97023).
Comment 1 Fedora Update System 2026-09-30 08:13:54 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 02:00:58 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 01:42:21 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.