Bug 2456383

Summary:	CVE-2026-34078 flatpak: Flatpak: Arbitrary code execution via crafted symlinks in sandbox-expose options [fedora-42]
Product:	[Fedora] Fedora	Reporter:	Vipul Nair <vinair>
Component:	flatpak	Assignee:	David King <amigadave>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	42	CC:	amigadave, debarshir, gnome-sig, kalevlember, renner0
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["c949ef87-ebe5-46d1-9fc9-e864508f22d0"]}
Fixed In Version:	flatpak-1.16.6-1.fc42	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-04-28 01:11:40 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:
Bug Depends On:
Bug Blocks:	2456276

Description Vipul Nair 2026-04-08 09:03:16 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.

Comment 1 Fedora Update System 2026-04-10 19:30:45 UTC

FEDORA-2026-2a3e305ac4 (flatpak-1.16.6-1.fc42) has been submitted as an update to Fedora 42.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-2a3e305ac4

Comment 2 Fedora Update System 2026-04-12 16:13:26 UTC

FEDORA-2026-2a3e305ac4 has been pushed to the Fedora 42 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-2a3e305ac4`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-2a3e305ac4

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 3 Fedora Update System 2026-04-28 01:11:40 UTC

FEDORA-2026-2a3e305ac4 (flatpak-1.16.6-1.fc42) has been pushed to the Fedora 42 stable repository.
If problem still persists, please make note of it in this bug report.