CVE-2026-34178: Canonical Lxd

Critical severity, CVSS 9.1. EPSS: 0.7% chance of exploitation in the next 30 days.

In Canonical LXD before 6.8, the backup import path validates project restrictions against backup/index.yaml in the supplied tar archive but creates the instance from backup/container/backup.yaml, a separate file in the same archive that is never checked against project restrictions. An authenticated remote attacker with instance-creation permission in a restricted project can craft a backup archive where backup.yaml carries restricted settings such as security.privileged=true or raw.lxc directives, bypassing all project restriction enforcement and allowing full host compromise.

Affected products

• Canonical Lxd: from 4.12, up to and including 5.0.6; from 5.21.0, up to and including 5.21.4; from 6.0, up to and including 6.7

Published 2026-04-09. Last modified 2026-06-17.