#VU125585 Improper access control in lxd - CVE-2026-34179
Published: April 9, 2026
Vulnerability identifier: #VU125585
Vulnerability risk: Low
CVSSv4.0: 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-2026-34179
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
lxd
lxd
Software vendor:
Linux Containers
Linux Containers
Description
The vulnerability allows a remote user to escalate privileges to cluster admin.
The vulnerability exists due to improper access control in the doCertificateUpdate handler for the /1.0/certificates/{fingerprint} endpoint when processing PUT or PATCH requests that update TLS certificate records. A remote privileged user can send a crafted request to change the certificate type from client to server and escalate privileges to cluster admin.
The issue affects deployments using legacy restricted TLS certificates through the /1.0/certificates API, and the privilege change takes effect after the identity cache refresh.
Remediation
Install security update from vendor's website.