CRITICAL: CVE-2026-34078 (CVSS 10) — flatpak flatpak

CVE: CVE-2026-34078

CVSS: 10 (3.1) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Severity: CRITICAL

Status: Critical advisory

Affected

flatpak flatpak

Summary

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.

Verified Sources

References

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

_Validated by the Lyrie Threat Intelligence Pipeline — 3 independent sources confirmed before publication. No speculation._

Lyrie Verdict

A vulnerability of this severity is exactly what Lyrie's anti-rogue-AI defense is built for: continuous, autonomous monitoring that doesn't wait for human reaction time.

#flatpak #critical