Public vulnerability disclosure

CVE-2026-96275

Flatpak: flatpak: arbitrary write access as root via extra-data extraction

publishedCWE-22

A malicious or compromised Flatpak repository can write attacker-controlled content to arbitrary locations on the host filesystem via extract_extra_data(). On system installs, the write happens as root. Two issues combine: `files/extra` is resolved via path operations that follow symlinks, and blob names from `xa.extra-data-sources` are not sanitized against `..` traversal.

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Technical severity8.8 highCVSS 3.1 · CNA: redhat

Published2026-09-23Source updated 2026-11-02

Collected2026-11-022 attributed sources

Fixes and workarounds

Workaround

Avoid installing Flatpak extensions from non-trusted sources.

Source: CNA: redhat

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
Red Hat Enterprise Linux 10 Red Hat `flatpak` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.16.0-9.el10_2.4; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8 Red Hat `flatpak` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.12.9-7.el8_10; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9 Red Hat `flatpak` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.12.9-4.el9_8.4; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat `flatpak` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.12.7-5.el9_2.5; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Red Hat `flatpak` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.12.9-3.el9_4.5; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9.6 Extended Update Support Red Hat `flatpak` https://access.redhat.com/downloads/content/package-browser/	≥ 0:1.12.9-4.el9_6.5; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 7 Red Hat `flatpak` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 8.8 high	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`	CNA: redhat

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://access.redhat.com/errata/RHSA-2026:80497CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:80498CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:80687CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:89733CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:90364CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:92369CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-96275CNA: redhat · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2539416CNA: redhat · issue-tracking, x_refsource_REDHAT
https://github.com/flatpak/flatpak/security/advisories/GHSA-fqx6-vh4p-42cgCNA: redhat