Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Canonical | Lxd | >= 5.0.0, < 5.0.8 |
Related Weaknesses (CWE)
References
- https://github.com/canonical/lxd/pull/18605Patch
- https://github.com/canonical/lxd/pull/18651Patch
- https://github.com/canonical/lxd/security/advisories/GHSA-v9wr-9r7q-fh4gVendor AdvisoryExploitMitigation
- https://github.com/canonical/lxd/security/advisories/GHSA-v9wr-9r7q-fh4gVendor AdvisoryExploitMitigation
FAQ
What is CVE-2026-62420?
CVE-2026-62420 is a vulnerability with a CVSS score of 9.9 (CRITICAL). 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-pro...
How severe is CVE-2026-62420?
CVE-2026-62420 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-62420?
Check the references section above for vendor advisories and patch information. Affected products include: Canonical Lxd.