Vulnerability · Published Aug 12, 2026 · Assigned by canonical
CVE-2026-62420Cross-project cluster migration bypasses project restrictions via cluster notification flag
Critical 9.9
In plain English
A critical-severity incorrect authorization in LXD from Canonical. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities).
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | lxd | no fix listed | DEBIAN-CVE-2026-62420 |
| Debian:13 | lxd | no fix listed | DEBIAN-CVE-2026-62420 |
Affected products (as reported)
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H