CVE-2026-76925

EUVD-2026-71774
A flaw was found in Flatpak. A Time-of-check to time-of-use (TOCTOU) race condition exists in the `org.freedesktop.Flatpak.SystemHelper` component. This vulnerability occurs because a privileged `chmod` operation executes before the OSTree repository validation within the `Deploy()` function. An attacker can exploit this timing window to redirect symlinks to arbitrary files, potentially leading to unauthorized file manipulation or information disclosure.
TOCTOU
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.8 MEDIUM
LOCAL
HIGH
LOW
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 0.9%
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
flatpak
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
flatpak
Amazon Linux 2023
0:1.18.1-1.amzn2023
fixed
flatpak-debuginfo
Amazon Linux 2023
0:1.18.1-1.amzn2023
fixed
flatpak-debugsource
Amazon Linux 2023
0:1.18.1-1.amzn2023
fixed
flatpak-devel
Amazon Linux 2023
0:1.18.1-1.amzn2023
fixed
flatpak-libs
Amazon Linux 2023
0:1.18.1-1.amzn2023
fixed
flatpak-libs-debuginfo
Amazon Linux 2023
0:1.18.1-1.amzn2023
fixed
flatpak-selinux
Amazon Linux 2023
0:1.18.1-1.amzn2023
fixed
flatpak-session-helper
Amazon Linux 2023
0:1.18.1-1.amzn2023
fixed
flatpak-session-helper-debuginfo
Amazon Linux 2023
0:1.18.1-1.amzn2023
fixed
flatpak-tests
Amazon Linux 2023
0:1.18.1-1.amzn2023
fixed
flatpak-tests-debuginfo
Amazon Linux 2023
0:1.18.1-1.amzn2023
fixed