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CVE-2026-90616

CVE-2026-90616

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 7.4 · High · EPSS 0.2% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • flatpak

    Versions
    • ≥ 0, < 1.18.1: Affected (semver)

    Update to 1.18.1

  • flatpak Debian:12

    Versions
    • 1.14.10-1
    • 1.14.10-1~deb12u1
    • 1.14.10-1~deb12u2
    • 1.14.4-1
    • 1.14.4-1+deb12u1
    • 1.14.4-1+deb12u1~bpo11+1
    • 1.14.4-2
    • 1.14.5-1
    • 1.14.6-1
    • 1.14.6-1~deb13u1
    • 1.14.8-1
    • 1.14.8-1~deb12u1
    • 1.15.0-1
    • 1.15.0-2
    • 1.15.1-1
    • 1.15.10-1
    • 1.15.12-1
    • 1.15.2-1
    • 1.15.3-1
    • 1.15.4-1
    • 1.15.6-1
    • 1.15.7-1
    • 1.15.8-1
    • 1.15.9-1
    • 1.15.91-1
    • 1.16.0-1
    • 1.16.0-2
    • 1.16.0-2~bpo12+1
    • 1.16.1-1
    • 1.16.1-1~bpo12+1
    • 1.16.1-2
    • 1.16.1-3
    • 1.16.2-1
    • 1.16.2-1~deb13u1
    • 1.16.3-1
    • 1.16.3-1~deb13u1
    • 1.16.4-1
    • 1.16.4-2
    • 1.16.5-1
    • 1.16.6-1
    • 1.16.6-1~deb13u1
    • 1.16.6-1~deb13u1~bpo12+1
    • 1.16.6-1~deb13u2
    • 1.16.6-1~deb13u3
    • 1.17.2-1
    • 1.17.3-1
    • 1.17.3-2
    • 1.17.6-1
    • 1.18.0-1
    • 1.18.1-1
    • 1.18.2-1
    • 1.18.3-1
    • 1.18.4-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • flatpak Debian:13

    Versions
    • 1.16.1-1
    • 1.16.1-2
    • 1.16.1-3
    • 1.16.2-1
    • 1.16.2-1~deb13u1
    • 1.16.3-1
    • 1.16.3-1~deb13u1
    • 1.16.4-1
    • 1.16.4-2
    • 1.16.5-1
    • 1.16.6-1~deb13u1
    • 1.16.6-1~deb13u1~bpo12+1
    • 1.16.6-1~deb13u2
    Affected ranges
    • ECOSYSTEM: < 1.16.6-1~deb13u3

    Update to 1.16.6-1~deb13u3

  • flatpak Debian:14

    Versions
    • 1.16.1-1
    • 1.16.1-2
    • 1.16.1-3
    • 1.16.2-1
    • 1.16.2-1~deb13u1
    • 1.16.3-1
    • 1.16.3-1~deb13u1
    • 1.16.4-1
    • 1.16.4-2
    • 1.16.5-1
    • 1.16.6-1
    • 1.16.6-1~deb13u1
    • 1.16.6-1~deb13u1~bpo12+1
    • 1.16.6-1~deb13u2
    • 1.16.6-1~deb13u3
    • 1.17.2-1
    • 1.17.3-1
    • 1.17.3-2
    • 1.17.6-1
    • 1.18.0-1
    Affected ranges
    • ECOSYSTEM: < 1.18.1-1

    Update to 1.18.1-1

  • flatpak Ubuntu:Pro:18.04:LTS

    Versions
    • 0.8.7-5
    • 0.10.0-1
    • 0.10.0-2
    • 0.10.1-1
    • 0.10.2-1
    • 0.10.2.1-1
    • 0.10.2.1-2
    • 0.10.3-1
    • 0.11.1-0ubuntu1
    • 0.11.3-2
    • 0.11.3-3
    • 0.11.7-0ubuntu0.1
    • 1.0.1-0ubuntu0.1
    • 1.0.6-0ubuntu0.1
    • 1.0.7-0ubuntu0.18.04.1
    • 1.0.8-0ubuntu0.18.04.1
    • 1.0.9-0ubuntu0.1
    • 1.0.9-0ubuntu0.2
    • 1.0.9-0ubuntu0.3
    • 1.0.9-0ubuntu0.4
    • 1.0.9-0ubuntu0.4+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • flatpak Ubuntu:Pro:20.04:LTS

    Versions
    • 1.4.3-1
    • 1.6.0-1
    • 1.6.1-1
    • 1.6.2-1
    • 1.6.3-1
    • 1.6.5-0ubuntu0.1
    • 1.6.5-0ubuntu0.2
    • 1.6.5-0ubuntu0.3
    • 1.6.5-0ubuntu0.4
    • 1.6.5-0ubuntu0.5
    • 1.6.5-0ubuntu0.5+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • flatpak Ubuntu:Pro:22.04:LTS

    Versions
    • 1.10.2-3
    • 1.12.2-1
    • 1.12.2-2
    • 1.12.3-1
    • 1.12.4-1
    • 1.12.5-1
    • 1.12.6-1
    • 1.12.7-1
    • 1.12.7-1ubuntu0.1
    • 1.12.7-1ubuntu0.1+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • flatpak Ubuntu:Pro:24.04:LTS

    Versions
    • 1.14.4-2
    • 1.14.5-1
    • 1.14.5-1build1
    • 1.14.5-1build4
    • 1.14.5-1build5
    • 1.14.5-1build6
    • 1.14.6-1
    • 1.14.6-1ubuntu0.1
    • 1.14.6-1ubuntu0.1+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • flatpak Ubuntu:26.04:LTS

    Versions
    • 1.16.1-2ubuntu1
    • 1.16.1-3ubuntu1
    • 1.16.2-1
    • 1.16.3-1
    • 1.16.3-1build1
    • 1.16.4-1
    • 1.16.4-2
    • 1.16.6-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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