CVE-2026-63300

critical · 9.9

An improper validation vulnerability in the instancePostMigration function in lxd/instance_post.go of LXD allows an authenticated attacker with can_create_instances permissions on a restricted project to bypass project-level security restrictions. When migrating an instance between projects, LXD fails to validate the instance's configuration against the target project's enforced restrictions (such as restricted.containers.lowlevel, restricted.devices.*, and restricted.networks.access). An attacker can exploit this by creating a disallowed or high-privilege instance in an unrestricted project and subsequently moving it into the restricted project.

9.9

CVSS

0.5%

EPSS (exploit prob.)

43rd

EPSS percentile

2026-08-12

Published

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

Weaknesses

CWE-862

Affected products

Vendor	Product	Affected versions
canonical	lxd	>= 5.0.0, < 5.0.8
canonical	lxd	>= 5.1, < 5.21.6
canonical	lxd	>= 6.0, < 6.10

Check a specific version with /api/v1/cve/match.

References

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-63300