Vulnerability · Published Sep 28, 2026 · Assigned by redhat
CVE-2026-97026Flatpak: flatpak: world-writable temporary child repositories in system-helper cache path
Low 3.9
In plain English
A low-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | flatpak | no fix listed | DEBIAN-CVE-2026-97026 |
| Debian:13 | flatpak | 1.16.6-1~deb13u3 | DEBIAN-CVE-2026-97026 |
| Debian:14 | flatpak | 1.18.4-1 | DEBIAN-CVE-2026-97026 |
| Ubuntu:26.04:LTS | flatpak | no fix listed | UBUNTU-CVE-2026-97026 |
| Ubuntu:26.10 | flatpak | no fix listed | UBUNTU-CVE-2026-97026 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
Weakness: CWE-378 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L
References
- https://access.redhat.com/security/cve/CVE-2026-97026 vdb-entry, x_refsource_REDHAT
- RHBZ#2542637 issue-tracking, x_refsource_REDHAT
- https://github.com/flatpak/flatpak/security/advisories/GHSA-r9w3-qx54-qvc8