---
id: CVE-2026-63295
title: >-
  An authorization bypass vulnerability in LXD allows an authenticated attacker
  to bypass project-level container isolation restrictions
summary: >-
  An authorization bypass vulnerability in LXD allows an authenticated attacker
  to bypass project-level container isolation restrictions. When a project is
  configured with restrictions on container privileges (such as enforcing
  restricted.…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-863
vendor: canonical
product: lxd
affected:
  - 'lxd >= 4.0.0, < 4.0.12'
  - 'lxd >= 5.0.0, < 5.0.8'
  - 'lxd >= 5.1, < 5.21.6'
  - 'lxd >= 6.0, < 6.10'
patched:
  - lxd 6.10
published: '2026-08-12'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T15:13:26.143'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63295'
references:
  - url: 'https://github.com/canonical/lxd/security/advisories/GHSA-7vp9-3vmp-c5jm'
    label: security@ubuntu.com
  - url: 'https://github.com/canonical/lxd/security/advisories/GHSA-7vp9-3vmp-c5jm'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00236
epssPercentile: 0.14894
ingestedAt: '2026-09-11T17:50:33.510Z'
---

## Overview

An authorization bypass vulnerability in LXD allows an authenticated attacker to bypass project-level container isolation restrictions. When a project is configured with restrictions on container privileges (such as enforcing restricted.containers.privilege=isolated), LXD fails to enforce the requirement if an instance configuration omits the security.idmap.isolated key. An attacker can exploit this flaw by creating or updating an instance without explicitly setting security.idmap.isolated, bypassing the target project's security constraints.

## Affected

- `lxd >= 4.0.0, < 4.0.12`
- `lxd >= 5.0.0, < 5.0.8`
- `lxd >= 5.1, < 5.21.6`
- `lxd >= 6.0, < 6.10`

## Remediation

Upgrade past the affected range:

- `lxd 6.10`