Canonical LXD up to 5.0.7/5.21.5/6.9 Instance Migration authorization

Summaryinfo

A vulnerability was found in Canonical LXD up to 5.0.7/5.21.5/6.9 and classified as very critical. The impacted element is an unknown function of the component Instance Migration. Executing a manipulation can lead to authorization. This vulnerability is handled as CVE-2026-62420. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Canonical LXD up to 5.0.7/5.21.5/6.9. It has been declared as very critical. This vulnerability affects an unknown code of the component Instance Migration. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-62420 since 07/14/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/12/2026).

Upgrading to version 5.0.8, 5.21.6 or 6.10 eliminates this vulnerability.

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Productinfo

Vendor

• Canonical

Name

• LXD

Version

• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5
• 5.0.6
• 5.0.7
• 5.21.0
• 5.21.1
• 5.21.2
• 5.21.3
• 5.21.4
• 5.21.5
• 6.0
• 6.1
• 6.2
• 6.3
• 6.4
• 6.5
• 6.6
• 6.7
• 6.8
• 6.9

License

• open-source

Website

• Product: https://github.com/canonical/lxd/

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