---
cve: "CVE-2026-34178"
severity: "CRITICAL"
cvss: 9.1
epss: "42%"
vendor: "Canonical"
kev: false
exploited: false
published: "2026-04-09 10:16:21"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T02:26:08+02:00"
---

# CVE-2026-34178

> 9.1 CRITICAL · 🧪 PoC

## Beschreibung

In Canonical LXD before 6.8, the backup import path validates project restrictions against backup/index.yaml in the supplied tar archive but creates the instance from backup/container/backup.yaml, a separate file in the same archive that is never checked against project restrictions. An authenticated remote attacker with instance-creation permission in a restricted project can craft a backup archive where backup.yaml carries restricted settings such as security.privileged=true or raw.lxc directives, bypassing all project restriction enforcement and allowing full host compromise.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Hoch | good |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 7b1f0b6acefa288398ead8dda48b046d7b2795a3 (Commit)
- c5184be310b13a8be5d9a5f286bfa1c0c286716e (Commit)

## Referenzen

- <https://github.com/canonical/lxd/security/advisories/GHSA-q96j-3fmm-7fv4>
- <https://github.com/canonical/lxd/pull/17921>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-34178) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_