CVE-2026-34078CRITICAL 10.0EPSS p73.2%

CVE-2026-34078CVE-2026-34078

Description

Flatpak is a Linux application sandboxing and distribution framework. Prior to 1.16.4, the Flatpak portal accepts paths in the sandbox-expose options which can be app-controlled symlinks pointing at arbitrary paths. Flatpak run mounts the resolved host path in the sandbox. This gives apps access to all host files and can be used as a primitive to gain code execution in the host context. This vulnerability is fixed in 1.16.4.

Scoring

CVSS 3.110.0 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS1.64% probability of exploitation · percentile 73.2% · 2026-06-19T12:03:05Z
Published2026-04-07
Last modified2026-04-24

Underlying weaknesses· 1

CWE-61

References

  1. https://github.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprg
  2. http://www.openwall.com/lists/oss-security/2026/04/09/8
  3. http://www.openwall.com/lists/oss-security/2026/04/10/14

1

TypeTargetConfidenceTier
WeaknessUNIX Symbolic Link (Symlink) Followingcwe-610%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.