CVE-2026-34179: Canonical Lxd

Critical severity, CVSS 9.1. EPSS: 0.4% chance of exploitation in the next 30 days.

In Canonical LXD versions 4.12 through 6.7, the doCertificateUpdate function in lxd/certificates.go does not validate the Type field when handling PUT/PATCH requests to /1.0/certificates/{fingerprint} for restricted TLS certificate users, allowing a remote authenticated attacker to escalate privileges to cluster admin.

Affected products

• Canonical Lxd: from 4.12, up to and including 5.0.6; from 5.21.0, up to and including 5.21.4; from 6.0, up to and including 6.7

Published 2026-04-09. Last modified 2026-06-17.