CVE-2026-34179

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

Published Apr 9, 2026 CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-6212-1 incus security update
Debian DSA Debian DSA DSA-6213-1 lxd security update
Github GHSA Github GHSA GHSA-c3h3-89qf-jqm5 LXD: Update of type field in restricted TLS certificate allows privilege escalation to cluster admin
History
Type Values Removed Values Added
CPEs cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*
Type Values Removed Values Added
First Time appeared Canonical
Canonical lxd
Vendors & Products Canonical
Canonical lxd
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Update of type field in restricted TLS certificate allows privilege escalation to cluster admin
Weaknesses CWE-915
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
canonical
Published
Updated
Apr 9, 2026, 11:54 AM
Reserved
Mar 26, 2026, 9:24 AM
Status
Analyzed
Published
Apr 9, 2026, 10:16 AM
Modified
Oct 26, 2026, 9:10 PM