File System Vulnerability in Flatpak Affects User Cache Permissions
CVE-2026-97026

3.9LOW

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Vendor
CVE Published:
28 September 2026

What is CVE-2026-97026?

Flatpak has a vulnerability that allows the creation of temporary child repository directories in the user cache with world-writable permissions (0777). This configuration poses a risk on multi-user systems where a permissive umask is set, enabling other local users to potentially read or alter the contents of these directories during application or runtime installations. Such unauthorized access could lead to installation failures, as any tampered content would not pass signature or digest verification, effectively treating it as untrusted.

References

https://access.redhat.com/security/cve/CVE-2026-97026
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2542637
issue-trackingx_refsource_REDHAT
https://github.com/flatpak/flatpak/security/advisories/GH...

CVSS V3.1

Score:
3.9
Severity:
LOW
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank AISLE for reporting this issue.
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