Improper access control in LXD - CVE-2026-34178
Published: April 9, 2026
Vulnerability identifier: #VU125586
CSH Severity: Low
CVSS v4: 8.6 [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]
CVE-ID: CVE-2026-34178
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
LXD
Debian Linux
lxd (Debian package)
incus (Debian package)
Debian Linux
lxd (Debian package)
incus (Debian package)
How to mitigate CVE-2026-34178
Install security update from vendor's website.
LXD - addressed in versions 5.0.7, 5.21.5, 6.8
lxd (Debian package) - addressed in versions 5.0.2+git20231211.1364ae4-9+deb13u5, 5.0.2-5+deb12u5
incus (Debian package) - update to 6.0.4-2+deb13u6
lxd (Debian package) - addressed in versions 5.0.2+git20231211.1364ae4-9+deb13u5, 5.0.2-5+deb12u5
incus (Debian package) - update to 6.0.4-2+deb13u6