Bug 2539419 (CVE-2026-96280) - CVE-2026-96280 flatpak: flatpak: Buffer overflow in OCI delta stream path names on 32-bit systems
Summary: CVE-2026-96280 flatpak: flatpak: Buffer overflow in OCI delta stream path nam...
Keywords:
Status: NEW
Alias: CVE-2026-96280
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-23 14:02 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 03:09:33 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 02:08:43 UTC
Red Hat Product Errata RHSA-2026:90364 0 None None None 2026-10-26 18:54:51 UTC
Red Hat Product Errata RHSA-2026:92221 0 None None None 2026-10-29 18:27:26 UTC
Red Hat Product Errata RHSA-2026:92369 0 None None None 2026-10-29 12:56:59 UTC
Red Hat Product Errata RHSA-2026:95493 0 None None None 2026-11-05 09:57:25 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 03:05:17 UTC
Red Hat Product Errata RHSA-2026:98490 0 None None None 2026-11-11 12:02:04 UTC
Red Hat Product Errata RHSA-2026:98595 0 None None None 2026-11-11 11:27:09 UTC
Red Hat Product Errata RHSA-2026:99010 0 None None None 2026-11-11 15:58:57 UTC

Description OSIDB Bzimport 2026-09-23 14:02:14 UTC 
GHSA-jr92-2v97-wgvc (https://github.com/flatpak/flatpak/security/advisories/GHSA-jr92-2v97-wgvc)

Description: The OCI delta stream parser read sizes as guint64 but passed them to GLib I/O and allocation functions expecting gsize (32 bits on 32-bit systems). The silent truncation causes undersized allocations while subsequent operations use the original 64-bit size, leading to heap buffer overflows. On 64-bit systems, gsize and guint64 are the same width, so the truncation does not occur and the issue is not practically exploitable.

Mitigation: Only install applications from trusted OCI registries. Flatpak remotes using the default OSTree transport are not affected. Fixed in 1.18.1 (backports available for 1.16.x). Reported by @swick.
Comment 1 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 2 Jon Orris 2026-10-12 03:09:32 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 3 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 4 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 5 Jon Orris 2026-10-26 18:54:50 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 6 Jon Orris 2026-10-29 12:56:58 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 7 Jon Orris 2026-10-29 18:27:25 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 8 Jon Orris 2026-11-05 09:57:24 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 9 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 10 errata-xmlrpc 2026-11-11 03:05:16 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 11 errata-xmlrpc 2026-11-11 11:27:08 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 12 errata-xmlrpc 2026-11-11 12:02:02 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 13 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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