CVE-2026-28384
Authenticated RCE via unsanitized compression_algorithm
- State
- Published
- Severity
- 9.4 Critical
- Published
- Mar 12, 2026
- Updated
- Mar 13, 2026
- Reserved
- Feb 27, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.4 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H | canonical |
Weaknesses
- CWE-78 Improper neutralization of special elements used in an OS command ('OS command injection')
Affected Products
| Product | Versions |
|---|---|
lxdCanonical |
|
References
- https://github.com/canonical/lxd/security/advisories/GHSA-4rmf-rcp8-2r9gvendor-advisory
- https://github.com/canonical/lxd/commit/043696a13171ace7dd4c2b32d34ce039ab629052patch
- https://github.com/canonical/lxd/commit/7046979645c2ce1b63b2f9e60ddf6cbc4c4b78f9patch
- https://github.com/canonical/lxd/commit/b7b411caf5c4971bfe2386c72128f44d7e2aaf4fpatch
- https://discourse.ubuntu.com/t/lxd-authenticated-remote-code-execution-fixes-available/78365media-coverage
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