CVE-2026-97026

Flatpak: flatpak: world-writable temporary child repositories in system-helper cache path

State: Published
Severity: 3.9 Low
Published: Sep 28, 2026
Updated: Sep 30, 2026
Reserved: Sep 23, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	3.9 Low	CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L	redhat

Weaknesses

CWE-378 Creation of Temporary File With Insecure Permissions

Affected Products

Product	Versions
Red Hat Enterprise Linux 10Red Hat
Red Hat Enterprise Linux 7Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 9Red Hat

References

https://access.redhat.com/security/cve/CVE-2026-97026vdb-entry
RHBZ#2542637issue-tracking
https://github.com/flatpak/flatpak/security/advisories/GHSA-r9w3-qx54-qvc8

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