---
cve: "CVE-2026-66898"
severity: "CRITICAL"
cvss: 9.9
epss: "34%"
vendor: "Canonical"
kev: false
exploited: false
published: "2026-08-12 20:07:32"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-05T15:30:03+02:00"
---

# CVE-2026-66898

> 9.9 CRITICAL · 🧪 PoC

## Beschreibung

A path traversal vulnerability in LXD allows an attacker to manipulate file system paths during backup import and restore operations. When importing or restoring a backup archive, LXD fails to validate instance and storage volume names contained within the archive metadata. An attacker can exploit this flaw by supplying a crafted backup archive with malicious instance or volume names containing path traversal sequences, potentially allowing file access or overwriting outside the designated restore directory.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- a55c9d0228552323d96cc330fb36f9471581c4ab (Commit)
- 2101d7f6efdaa7762e6593c857cb524bfcd2859b (Commit)

## Referenzen

- <https://github.com/canonical/lxd/security/advisories/GHSA-m857-c7gc-c984>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-66898) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_