Bug 2539416 (CVE-2026-96275) - CVE-2026-96275 flatpak: flatpak: Arbitrary write access as root via extra-data extraction
Summary: CVE-2026-96275 flatpak: flatpak: Arbitrary write access as root via extra-dat...
Keywords:
Status: NEW
Alias: CVE-2026-96275
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-23 14:01 UTC by OSIDB Bzimport
Modified: 2026-11-11 15:58 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-2026:80497 0 None None None 2026-10-12 03:09:34 UTC
Red Hat Product Errata RHSA-2026:80498 0 None None None 2026-10-12 02:15:27 UTC
Red Hat Product Errata RHSA-2026:80687 0 None None None 2026-10-12 10:04:46 UTC
Red Hat Product Errata RHSA-2026:89733 0 None None None 2026-10-26 02:08:42 UTC
Red Hat Product Errata RHSA-2026:90364 0 None None None 2026-10-26 18:54:49 UTC
Red Hat Product Errata RHSA-2026:92221 0 None None None 2026-10-29 18:27:28 UTC
Red Hat Product Errata RHSA-2026:92369 0 None None None 2026-10-29 12:56:58 UTC
Red Hat Product Errata RHSA-2026:95493 0 None None None 2026-11-05 09:57:23 UTC
Red Hat Product Errata RHSA-2026:98112 0 None None None 2026-11-11 01:44:34 UTC
Red Hat Product Errata RHSA-2026:98127 0 None None None 2026-11-11 03:05:16 UTC
Red Hat Product Errata RHSA-2026:98490 0 None None None 2026-11-11 12:02:01 UTC
Red Hat Product Errata RHSA-2026:98595 0 None None None 2026-11-11 11:27:08 UTC
Red Hat Product Errata RHSA-2026:99010 0 None None None 2026-11-11 15:58:58 UTC

Description OSIDB Bzimport 2026-09-23 14:01:47 UTC 
GHSA-fqx6-vh4p-42cg (https://github.com/flatpak/flatpak/security/advisories/GHSA-fqx6-vh4p-42cg)

Impact: A malicious or compromised Flatpak repository can write attacker-controlled content to arbitrary locations on the host filesystem. On system installs, the write happens as root.

Description: There are two vulnerabilities in extract_extra_data. It resolves files/extra inside the checked-out commit tree using GFile path operations, which follow symlinks. If the files entry in the OSTree commit is a symlink (e.g., files -> /tmp), the downloaded extra-data blobs are written at the symlink target instead. Additionally, extract_extra_data writes downloaded blobs to files/extra/<name> where <name> comes from xa.extra-data-sources in the commit metadata; g_file_get_child resolves .. components, so a name like ../metadata escapes the extra/ directory.

Fixed in 1.18.1 (backports available for 1.16.x). Found by @swick after investigating a report from AISLE in cooperation with Red Hat.
Comment 2 Jon Orris 2026-10-12 02:15:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:80498 https://access.redhat.com/errata/RHSA-2026:80498
Comment 3 Jon Orris 2026-10-12 03:09:34 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:80497 https://access.redhat.com/errata/RHSA-2026:80497
Comment 4 Jon Orris 2026-10-12 10:04:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:80687 https://access.redhat.com/errata/RHSA-2026:80687
Comment 5 Jon Orris 2026-10-26 02:08:42 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:89733 https://access.redhat.com/errata/RHSA-2026:89733
Comment 6 Jon Orris 2026-10-26 18:54:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:90364 https://access.redhat.com/errata/RHSA-2026:90364
Comment 7 Jon Orris 2026-10-29 12:56:57 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:92369 https://access.redhat.com/errata/RHSA-2026:92369
Comment 8 Jon Orris 2026-10-29 18:27:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:92221 https://access.redhat.com/errata/RHSA-2026:92221
Comment 9 Jon Orris 2026-11-05 09:57:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:95493 https://access.redhat.com/errata/RHSA-2026:95493
Comment 10 errata-xmlrpc 2026-11-11 01:44:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:98112 https://access.redhat.com/errata/RHSA-2026:98112
Comment 11 errata-xmlrpc 2026-11-11 03:05:15 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:98127 https://access.redhat.com/errata/RHSA-2026:98127
Comment 12 errata-xmlrpc 2026-11-11 11:27:07 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:98595 https://access.redhat.com/errata/RHSA-2026:98595
Comment 13 errata-xmlrpc 2026-11-11 12:02:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:98490 https://access.redhat.com/errata/RHSA-2026:98490
Comment 14 errata-xmlrpc 2026-11-11 15:58:56 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:99010 https://access.redhat.com/errata/RHSA-2026:99010
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