Canonical LXD up to 4.12/5.0.5/5.21.3/6.6 API compression_algorithm os command injection

Summaryinfo

A vulnerability labeled as critical has been found in Canonical LXD up to 4.12/5.0.5/5.21.3/6.6. Affected is an unknown function of the component API. Executing a manipulation of the argument compression_algorithm can lead to os command injection. This vulnerability appears as CVE-2026-28384. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in Canonical LXD up to 4.12/5.0.5/5.21.3/6.6. This vulnerability affects an unknown part of the component API. The manipulation of the argument compression_algorithm with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

An improper sanitization of the compression_algorithm parameter in Canonical LXD allows an authenticated, unprivileged user to execute commands as the LXD daemon on the LXD server via API calls to the image and backup endpoints. This issue affected LXD from 4.12 through 6.6 and was fixed in the snap versions 5.0.6-e49d9f4 (channel 5.0/stable), 5.21.4-1374f39 (channel 5.21/stable), and 6.7-1f11451 (channel 6.0 stable). The channel 4.0/stable is not affected as it contains version 4.0.10.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-28384 since 02/27/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1202.

The vulnerability scanner Nessus provides a plugin with the ID 302534 (Linux Distros Unpatched Vulnerability : CVE-2026-28384), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.0.6, 5.21.4 or 6.7 eliminates this vulnerability. Applying the patch 043696a13171ace7dd4c2b32d34ce039ab629052 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (302534). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Canonical

Name

• LXD

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12
• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5
• 5.21.0
• 5.21.1
• 5.21.2
• 5.21.3
• 6.0
• 6.1
• 6.2
• 6.3
• 6.4
• 6.5
• 6.6

License

• open-source

Website

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

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Once again VulDB remains the best source for vulnerability data.

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