CVE-2026-34179

Update of type field in restricted TLS certificate allows privilege escalation to cluster admin

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

Canonical · lxd

CVSS v3.1 UBUNTU

9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS

0.42% chance of exploitation in the next 30 days, 35th percentile

Published

2026-04-09

Proof-of-concept exploits (1)

• advisories/GHSA-c3h3-89qf-jqm5

Security advisories

• canonical/lxd/security/advisories/GHSA-c3h3-89qf-jqm5
• canonical/lxd/pull/17936

References

• CVE Record
• NVD entry