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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. (CVE-2026-76925)

0
Medium
VulnerabilityCVE-2026-76925gcveosvghsa-639f-3fwc-hmpxcve-2026-76925ghsaubuntu-cve-2026-76925ubuntu-18-04-ltsubuntu-20-04-ltsubuntu-22-04-ltsubuntu-24-04-ltsubuntu-26-04-ltsubuntu-pro-20-04-ltsubuntu-pro-22-04-ltsubuntu-pro-24-04-ltsubuntu-pro-18-04-ltsubuntu-26-10
Published: 09/04/2026 (09/04/2026, 22:17:00 UTC)
Source: GCVE Database
Product: flatpak

Description

A time-of-check to time-of-use (TOCTOU) race condition vulnerability exists in the org.freedesktop.Flatpak.SystemHelper component of Flatpak. This flaw could allow an attacker with limited privileges to cause a high impact on confidentiality and a low impact on integrity and availability. The vulnerability affects multiple specific versions of Flatpak. The CVSS 3.1 base score is 5.8, indicating a medium severity level.

CVSS v3.1

Score 5.8medium

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
Low
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L

Affected software

Ubuntu:Pro:18.04:LTSmore threats →ghsa
flatpak
pkg:deb/ubuntu/flatpak?arch=source&distro=esm-apps/bionic
Affected versions
=0.8.7-5=0.10.0-1=0.10.0-2=0.10.1-1=0.10.2-1=0.10.2.1-1=0.10.2.1-2=0.10.3-1=0.11.1-0ubuntu1=0.11.3-2=0.11.3-3=0.11.7-0ubuntu0.1=1.0.1-0ubuntu0.1=1.0.6-0ubuntu0.1=1.0.7-0ubuntu0.18.04.1=1.0.8-0ubuntu0.18.04.1=1.0.9-0ubuntu0.1=1.0.9-0ubuntu0.2=1.0.9-0ubuntu0.3=1.0.9-0ubuntu0.4=1.0.9-0ubuntu0.4+esm1
Ubuntu:Pro:20.04:LTSmore threats →ghsa
flatpak
pkg:deb/ubuntu/flatpak?arch=source&distro=esm-apps/focal
Affected versions
=1.4.3-1=1.6.0-1=1.6.1-1=1.6.2-1=1.6.3-1=1.6.5-0ubuntu0.1=1.6.5-0ubuntu0.2=1.6.5-0ubuntu0.3=1.6.5-0ubuntu0.4=1.6.5-0ubuntu0.5=1.6.5-0ubuntu0.5+esm1
Ubuntu:Pro:22.04:LTSmore threats →ghsa
flatpak
pkg:deb/ubuntu/flatpak?arch=source&distro=esm-apps/jammy
Affected versions
=1.10.2-3=1.12.2-1=1.12.2-2=1.12.3-1=1.12.4-1=1.12.5-1=1.12.6-1=1.12.7-1=1.12.7-1ubuntu0.1=1.12.7-1ubuntu0.1+esm1
Ubuntu:Pro:24.04:LTSmore threats →ghsa
flatpak
pkg:deb/ubuntu/flatpak?arch=source&distro=esm-apps/noble
Affected versions
=1.14.4-2=1.14.5-1=1.14.5-1build1=1.14.5-1build4=1.14.5-1build5=1.14.5-1build6=1.14.6-1=1.14.6-1ubuntu0.1=1.14.6-1ubuntu0.1+esm1
Ubuntu:26.10more threats →ghsa
flatpak
pkg:deb/ubuntu/flatpak?arch=source&distro=stonking
Affected versions
=1.16.6-1=1.18.0-1=1.18.1-1=1.18.2-1=1.18.4-1
Ubuntu:26.04:LTSmore threats →ghsa
flatpak
pkg:deb/ubuntu/flatpak?arch=source&distro=resolute
Affected versions
=1.16.1-2ubuntu1=1.16.1-3ubuntu1=1.16.2-1=1.16.3-1=1.16.3-1build1=1.16.4-1=1.16.4-2=1.16.6-1

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 10/18/2026, 02:40:41 UTC

Technical Analysis

CVE-2026-76925 describes a TOCTOU race condition in the org.freedesktop.Flatpak.SystemHelper component of Flatpak. This vulnerability arises when a system component improperly handles timing between checking a condition and using a resource, potentially allowing an attacker with low privileges to exploit the race window. The flaw impacts confidentiality significantly and has lesser impacts on integrity and availability. The vulnerability affects many specific Flatpak versions as enumerated, with no explicit patch or remediation details provided in the source data.

Potential Impact

An attacker with low privileges could exploit this TOCTOU race condition to gain unauthorized access to sensitive information (high confidentiality impact) and cause limited integrity and availability issues. There is no indication of active exploitation in the wild. The medium CVSS score reflects a moderate risk level.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users should monitor vendor communications for updates and apply patches once available.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
GHSA-639f-3fwc-hmpx
Osv Schema Version
1.4.0
Aliases
["CVE-2026-76925"]
Database Specific Severity
MODERATE
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6a9c2598acd9273b49fbe5ca

Added to database: 09/05/2026, 14:22:16 UTC

Last enriched: 10/18/2026, 02:40:41 UTC

Last updated: 10/19/2026, 18:48:23 UTC

Views: 62

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