CVE-2026-28384

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.

Score

CVSS 3.1 9.9 Critical

Status

Analyzed - security@ubuntu.com

Published

2026-03-12

Last modified

2026-03-13

Weaknesses

CWE-78

Affected products

• Lxd (Canonical)

References

• https://discourse.ubuntu.com/t/lxd-authenticated-remote-code-execution-fixes-available/78365
• https://github.com/canonical/lxd/commit/043696a13171ace7dd4c2b32d34ce039ab629052
• https://github.com/canonical/lxd/commit/7046979645c2ce1b63b2f9e60ddf6cbc4c4b78f9
• https://github.com/canonical/lxd/commit/b7b411caf5c4971bfe2386c72128f44d7e2aaf4f
• https://github.com/canonical/lxd/security/advisories/GHSA-4rmf-rcp8-2r9g