CVE-2026-63295

Medium

Description

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.

SeverityMedium

CVSS4.3

Exploit probability—

ProductCanonical Lxd

PublishedAug 12, 2026

First seenAug 12, 2026

Weakness typeCWE-863Incorrect authorization

How to fix

Update

canonical lxd4.0.12, 5.0.8, 5.21.6, 6.10 or later

Vendor advisories

github.com/canonical/lxd/security/advisories/GHSA-7vp9-3vmp-c5jm

Affected products

Product	Affected versions	Fixed in
canonical lxd	4.0.0 ≤ v < 4.0.12, 5.0.0 ≤ v < 5.0.8, 5.1 ≤ v < 5.21.6, 6.0 ≤ v < 6.10	4.0.12, 5.0.8, 5.21.6, 6.10

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