Description
Flatpak creates temporary child repository directories under the user cache with world-writable permissions (0777). On multi-user systems with a permissive umask, other local users could read or modify the temporary directory used while installing apps or runtimes, potentially causing installation failures (denial of service); tampered content would fail signature/digest verification rather than being trusted.
Published: 2026-09-28
Score: 3.9 Low
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Workaround

Set a umask that does not allow other users to write to the cache directory, for example: umask 022. Note that a umask that does not allow read/exec access by all (for example 027 or 077) will prevent the flatpak-system-helper from reading the temporary directory directly, resulting in falling back to copying the repository inefficiently, with a warning.

Tracking

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6524-1 flatpak security update
History

Mon, 28 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Description Flatpak creates temporary child repository directories under the user cache with world-writable permissions (0777). On multi-user systems with a permissive umask, other local users could read or modify the temporary directory used while installing apps or runtimes, potentially causing installation failures (denial of service); tampered content would fail signature/digest verification rather than being trusted.
Title Flatpak: flatpak: world-writable temporary child repositories in system-helper cache path
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-378
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 3.9, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L'}


Subscriptions

Redhat Enterprise Linux
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-28T20:57:03.702Z

Reserved: 2026-09-23T21:11:59.431Z

Link: CVE-2026-97026

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-28T21:17:19.907

Modified: 2026-09-28T21:17:19.907

Link: CVE-2026-97026

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-378

    Creation of Temporary File With Insecure Permissions