Time-of-check Time-of-use (TOCTOU) Affecting flatpak-tests-debuginfo package, versions <0:1.18.1-1.amzn2023


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.1% (1st percentile)

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  • Snyk IDSNYK-AMZN2023-FLATPAKTESTSDEBUGINFO-20249170
  • published29 Sept 2026
  • disclosed4 Sept 2026

Introduced: 4 Sep 2026

NewCVE-2026-76925  (opens in a new tab)
CWE-367  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 flatpak-tests-debuginfo to version 0:1.18.1-1.amzn2023 or higher.
This issue was patched in ALAS2023-2026-3143.

NVD Description

Note: Versions mentioned in the description apply only to the upstream flatpak-tests-debuginfo package and not the flatpak-tests-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1