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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-96275
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-23 15:17:32 UTC
Updated2026-10-26 03:17:11 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.003730000 probability, percentile 0.292680000 (date 2026-10-12)

Problem Types: CWE-22 | CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNACVSS8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 10 unaffected 0:1.16.0-9.el10_2.4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:1.12.9-7.el8_10 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:1.12.9-4.el9_8.4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support unaffected 0:1.12.9-4.el9_6.5 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:89733 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:80497 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:80498 [email protected] access.redhat.com
access.redhat.com/security/cve/CVE-2026-96275 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:80687 [email protected] access.redhat.com
github.com/flatpak/flatpak/security/advisories/GHSA-fqx6-vh4p-42cg [email protected] github.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Upstream acknowledges Sebastian Wick as the original reporter. (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-08-11T00:00:00.000ZReported to Red Hat.
CNA2026-08-11T00:00:00.000ZMade public.

Workarounds

CNA: Avoid installing Flatpak extensions from non-trusted sources.

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