Bug 2456276 (CVE-2026-34078) - CVE-2026-34078 flatpak: Flatpak: Arbitrary code execution via crafted symlinks in sandbox-expose options
Summary: CVE-2026-34078 flatpak: Flatpak: Arbitrary code execution via crafted symlink...
Keywords:
Status: NEW
Alias: CVE-2026-34078
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2456383 2456384
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-07 22:01 UTC by OSIDB Bzimport
Modified: 2026-05-28 17:39 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:21755 0 None None None 2026-05-28 17:39:06 UTC
Red Hat Product Errata RHSA-2026:21756 0 None None None 2026-05-28 17:25:26 UTC
Red Hat Product Errata RHSA-2026:21757 0 None None None 2026-05-28 17:31:04 UTC

Description OSIDB Bzimport 2026-04-07 22:01:32 UTC 
Flatpak is a Linux application sandboxing and distribution framework. Prior to 1.16.4, the Flatpak portal accepts paths in the sandbox-expose options which can be app-controlled symlinks pointing at arbitrary paths. Flatpak run mounts the resolved host path in the sandbox. This gives apps access to all host files and can be used as a primitive to gain code execution in the host context. This vulnerability is fixed in 1.16.4.
Comment 2 errata-xmlrpc 2026-05-28 17:25:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:21756 https://access.redhat.com/errata/RHSA-2026:21756
Comment 3 errata-xmlrpc 2026-05-28 17:31:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:21757 https://access.redhat.com/errata/RHSA-2026:21757
Comment 4 errata-xmlrpc 2026-05-28 17:39:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:21755 https://access.redhat.com/errata/RHSA-2026:21755
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