Link Following Affecting flatpak-tests-debuginfo package, versions <0:1.18.1-1.amzn2023


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.18% (7th percentile)

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  • Snyk IDSNYK-AMZN2023-FLATPAKTESTSDEBUGINFO-20250187
  • published29 Sept 2026
  • disclosed12 Sept 2026

Introduced: 12 Sep 2026

NewCVE-2026-90616  (opens in a new tab)
CWE-59  (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.

In Flatpak before 1.18.1, a malicious sandboxed app can obtain arbitrary read and write access to files on the host, which can be escalated to arbitrary code execution on the host, a different vulnerability than CVE-2026-76925. Flatpak creates a few app data directories (e.g., /var/cache, /var/data, /var/config, and /var/tmp) in every sandbox on every app launch where, in some cases, components of the path are attacker-controlled. Missing symlink protection can redirect the directories. Some of these directories are bind-mounted by Flatpak by passing the path (e.g., /home/user/.var/app/APP_ID/cache/tmp), which contains attacker-controlled directories (tmp) to bwrap --bind SRC DST. bwrap passes the path on to the kernel, which then follows symlinks. A malicious symlink can point to arbitrary locations on the host and it will become mounted inside the sandbox.

CVSS Base Scores

version 3.1