Bug 2524927

Summary: CVE-2026-76925 flatpak: Flatpak: TOCTOU race condition allows symlink redirection [fedora-all]
Product: [Fedora] Fedora Reporter: Sandipan Roy <saroy>
Component: flatpakAssignee: David King <amigadave>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: amigadave, darunesh, debarshir, gnome-sig, kalevlember, renner0
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["b2d2c1f7-60ea-4e96-9a43-22cca196b2ff"]}
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-09-04 18:31:15 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: 2520099    

Description Sandipan Roy 2026-08-27 10:49:32 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.

TOCTOU race in org.freedesktop.Flatpak.SystemHelper — privileged chmod runs before OSTree repo validation in Deploy(), allowing symlink redirection to arbitrary files.