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OpenAdvisories
High ALAS2-2026-3959 2 CVEs

Important: flatpak security update (Amazon Linux 2)

Published Sep 28, 2026 · Updated Sep 30, 2026

Summary

Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: CVE-2026-96275: A malicious or compromised Flatpak repository can write attacker-controlled content to arbitrary locations on the host filesystem via extract_extra_data(). On system installs, the write happens as root. Two issues combine: `files/extra` is resolved via path operations that follow symlinks, and blob names from `xa.extra-data-sources` are not sanitized against `..` traversal. CVE-2026-90616: 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.

Fixed packages 5

ReleasePackageFixed in
Amazon Linux · 2 flatpak 0:1.0.9-10.amzn2.0.8
Amazon Linux · 2 flatpak-builder 0:1.0.0-10.amzn2.0.8
Amazon Linux · 2 flatpak-debuginfo 0:1.0.9-10.amzn2.0.8
Amazon Linux · 2 flatpak-devel 0:1.0.9-10.amzn2.0.8
Amazon Linux · 2 flatpak-libs 0:1.0.9-10.amzn2.0.8

Vulnerabilities 2

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-90616.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-96275.html