Bug 2539423 (CVE-2026-96284)

Summary: CVE-2026-96284 flatpak: flatpak: Arbitrary read-access to files in the system-helper context via OCI symlink following
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A malicious user can get read-access to files in the flatpak-system-helper context if a system OCI repository is configured, because the OCI code paths in the system helper follow symlinks when importing OCI images that are under the user's control.
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Description OSIDB Bzimport 2026-09-23 14:04:46 UTC 
GHSA-2fxp-43j9-pwvc (https://github.com/flatpak/flatpak/security/advisories/GHSA-2fxp-43j9-pwvc)

Description: The OCI code paths in the system helper will follow symlinks when importing OCI images which are under the user's control, allowing a malicious user to get read-access to files in the system-helper context if a system OCI repository is configured.

Mitigation: Remove all OCI system remotes. Patched in 1.16.4 and 1.18.0. Credit: @smcv.