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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.62%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 4.0
- 9.4 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.62% probability · 48th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-78
- Affected
- canonical/lxd
- Source
- security@ubuntu.com
References
- https://discourse.ubuntu.com/t/lxd-authenticated-remote-code-execution-fixes-available/78365Issue Tracking
- https://github.com/canonical/lxd/commit/043696a13171ace7dd4c2b32d34ce039ab629052Patch
- https://github.com/canonical/lxd/commit/7046979645c2ce1b63b2f9e60ddf6cbc4c4b78f9Patch
- https://github.com/canonical/lxd/commit/b7b411caf5c4971bfe2386c72128f44d7e2aaf4fPatch
- https://github.com/canonical/lxd/security/advisories/GHSA-4rmf-rcp8-2r9gVendor Advisory
- https://github.com/canonical/lxd/security/advisories/GHSA-4rmf-rcp8-2r9gVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.