---
id: CVE-2026-76925
title: A flaw was found in Flatpak
summary: >-
  A flaw was found in Flatpak. A Time-of-check to time-of-use (TOCTOU) race
  condition exists in the `org.freedesktop.Flatpak.SystemHelper` component. This
  vulnerability occurs because a privileged `chmod` operation executes before
  the OSTr…
severity: medium
cvss: 5.8
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L'
cwe:
  - CWE-367
vendor: Red Hat
product: flatpak
affected:
  - flatpak (all versions)
  - flatpak (all versions)
  - flatpak (all versions)
  - flatpak (all versions)
published: '2026-09-04'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T19:08:15.590'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76925'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-76925'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2520099'
    label: secalert@redhat.com
tags:
  - nvd
  - cve.org
epss: 0.00102
epssPercentile: 0.00877
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T13:00:30.486927Z'
ingestedAt: '2026-09-08T15:33:26.965Z'
---

## Overview

A flaw was found in Flatpak. A Time-of-check to time-of-use (TOCTOU) race condition exists in the `org.freedesktop.Flatpak.SystemHelper` component. This vulnerability occurs because a privileged `chmod` operation executes before the OSTree repository validation within the `Deploy()` function. An attacker can exploit this timing window to redirect symlinks to arbitrary files, potentially leading to unauthorized file manipulation or information disclosure.

## Remediation

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