by Kastro
Paper/Archive/CVE-2026-28384

CVE-2026-28384

Canonical lxd — Authenticated RCE via unsanitized compression_algorithm

EPSS 0.7%public exploitCVSS 9.9
critical.is priorityof 100
50
CVSS 9.9 (NVD)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 53.1.531 × 2010.6Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
lxd6.0 – < 6.76.7CNA
lxd5.21.0 – < 5.21.45.21.4CNA
lxd5.0.0 – < 5.0.65.0.6CNA
lxd4.12–CNA

Scores by source

NVD9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
canonical (CNA)9.4CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/canonical/lxd/security/advisories/GHSA-4rmf-rcp8-2r9gpatchgithub.com/canonical/lxd/commit/043696a13171ace7dd4c2b32d34ce039ab629052patchgithub.com/canonical/lxd/commit/7046979645c2ce1b63b2f9e60ddf6cbc4c4b78f9patchgithub.com/canonical/lxd/commit/b7b411caf5c4971bfe2386c72128f44d7e2aaf4frefdiscourse.ubuntu.com/t/lxd-authenticated-remote-code-execution-fixes-available/78365