---
cve: "CVE-2026-34078"
severity: "CRITICAL"
cvss: 9.3
epss: "1.7%"
vendor: "flatpak"
kev: false
exploited: false
published: "2026-04-07 21:27:45"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-12T05:52:50+02:00"
---

# CVE-2026-34078

> 9.3 CRITICAL · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 2cc39deb237776614f8bdecae1892e5229aeca60 (Commit)

## Referenzen

- <https://github.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprg>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-34078) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_