CVE-2026-28384: Canonical Lxd

Critical severity, CVSS 9.9. EPSS: 0.9% chance of exploitation in the next 30 days.

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.

Affected products

• Canonical Lxd: from 4.12, before 5.0.6 (fixed in 5.0.6); from 5.21.0, before 5.21.4 (fixed in 5.21.4); from 6.0, before 6.7 (fixed in 6.7)

Published 2026-03-12. Last modified 2026-09-18.