Improper access control in LXD - CVE-2026-34178
Published: April 9, 2026
Vulnerability identifier: #VU125586
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-34178
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Containers
Affected software:
LXD
LXD
Detailed vulnerability description
The vulnerability allows a remote user to bypass project restrictions and gain full host compromise.
The vulnerability exists due to improper access control in the LXD backup import process when importing a crafted instance backup archive. A remote privileged user can supply inconsistent backup/index.yaml and backup/container/backup.yaml files to bypass project restrictions and gain full host compromise.
Exploitation requires instance creation and operation permissions in a restricted project.
How to mitigate CVE-2026-34178
Install security update from vendor's website.