---
cve: "CVE-2026-63297"
severity: "CRITICAL"
cvss: 9.9
epss: "20%"
vendor: "Canonical"
kev: false
exploited: false
published: "2026-08-12 20:17:47"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-05T17:53:26+02:00"
---

# CVE-2026-63297

> 9.9 CRITICAL · 🧪 PoC

## Beschreibung

An authorization bypass vulnerability in LXD due to a timing flaw during configuration merging allows an authenticated attacker to bypass target project restrictions during cross-project instance copies. When copying an instance to a target project, LXD performs restriction checks before configuration merging is complete, creating a time-of-check to time-of-use (TOCTOU) condition. An attacker can exploit this flaw to copy instances with disallowed high-privilege configurations into restricted projects, bypassing security controls.

## 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)

- 58b58151cfc3bd9fb0fedce26fcdd73a3e67bdb8 (Commit)
- c6146714d0cacd04b77598bac149f5db714834f6 (Commit)

## Referenzen

- <https://github.com/canonical/lxd/security/advisories/GHSA-v989-qw7w-xvg4>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-63297) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_