CVE-2026-62420: Canonical Lxd

Critical severity, CVSS 9.9. EPSS: 0.5% chance of exploitation in the next 30 days.

An authorization bypass vulnerability in LXD allows an authenticated attacker to bypass target project security restrictions during cross-project instance migrations. When moving an instance cross-project to a different cluster member via POST /1.0/instances/{name} with migration: true, project: <target>, and target: <member>, the destination node skips all project restriction checks because the request arrives as an internal cluster notification. An attacker can exploit this to introduce disallowed instance configurations into a restricted project.

Affected products

• Canonical Lxd: from 5.0.0, before 5.0.8 (fixed in 5.0.8); from 5.1, before 5.21.6 (fixed in 5.21.6); from 6.0, before 6.10 (fixed in 6.10)

Published 2026-08-12. Last modified 2026-09-11.