CVE-2026-28384

Critical

Description

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.

SeverityCritical

CVSS9.9

Exploit probability—

ProductCanonical Lxd

PublishedMar 12, 2026

First seenMar 12, 2026

Weakness typeCWE-78OS command injection

How to fix

Update

canonical lxd5.0.6, 5.21.4, 6.7 or later

Patches

Vendor advisories

github.com/canonical/lxd/security/advisories/GHSA-4rmf-rcp8-2r9g

Affected products

Product	Affected versions	Fixed in
canonical lxd	4.12 ≤ v < 5.0.6, 5.21.0 ≤ v < 5.21.4, 6.0 ≤ v < 6.7	5.0.6, 5.21.4, 6.7

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