---
id: CVE-2026-96275
title: >-
  A malicious or compromised Flatpak repository can write attacker-controlled
  content to arbitrary locations on the host filesystem via extract_extra_data()
summary: >-
  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` …
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-22
vendor: Red Hat
product: flatpak
affected:
  - flatpak (all versions)
  - flatpak (all versions)
  - flatpak (all versions)
  - flatpak (all versions)
published: '2026-09-23'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T18:17:34.003'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-96275'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-96275'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2539416'
    label: secalert@redhat.com
  - url: 'https://github.com/flatpak/flatpak/security/advisories/GHSA-fqx6-vh4p-42cg'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-96275.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-96275'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-96275'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-25T18:09:09.886853Z'
epss: 0.00361
epssPercentile: 0.27296
ingestedAt: '2026-09-23T15:26:23.424Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-09-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-96275.json)