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Fencer Vulns
low 3.9

CVE-2026-97026 json

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

published 2026-09-28 41 d ago modified 2026-11-06 2 d ago also EUVD-2026-88553

cvss
3.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

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.

Patch / fix

  • flatpak Debian 13 1.16.6-1~deb13u3
  • flatpak Debian 14 1.18.4-1

debian advisories DEBIAN-CVE-2026-97026

  • flatpak openSUSE Tumbleweed 1.18.4-1.1

opensuse advisories openSUSE-SU-2026:11918-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-97026 updated cvss 3.9

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

  • Red Hat Enterprise Linux 7 flatpak, flatpak-libs, flatpak-builder, flatpak 1.18.0-1.el10 Red Hat Enterprise Linux 8 flatpak, flatpak-libs, flatpak-selinux, flatpak 1.18.0-1.el10, flatpak-session-helper Red Hat Enterprise Linux 9 flatpak, flatpak-libs, flatpak-selinux, flatpak 1.18.0-1.el10, flatpak-session-helper Red Hat Enterprise Linux 10 flatpak 1.18.0-1.el10
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
39 d ago

Exploit prediction

0.10% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.9 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-378 Creation of Temporary File With Insecure Permissions

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.