CVE-2026-97026

low

Assigned by CNA: redhat

Published 2026-09-28 · Modified 2026-09-28

Discuss on Community Propose mitigation

CVSS v3

3.9

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L

CVSS v4 NEW

—

not yet in upstream

VIR risk

3.9

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.

Predictions

Exploit likelihood

39%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

Propose a mitigation on Community Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

Debian Mixed 4 releases

Version	Status	Fixed in
trixie	Fixed	`1.16.6-1~deb13u3`
sid	Fixed	`1.18.4-1`
forky	Affected	—
bookworm	Affected	—

References

CWEs

CWE-378

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.