CVE-2026-34179 PUBLISHED

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

Assigner: canonical
Reserved: 26.03.2026 Published: 09.04.2026 Updated: 09.04.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 9.1

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	High	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	Canonical
Product	lxd
Versions	Default: unaffected affected from 4.12.0 to 5.0.7 (excl.) affected from 5.1.0 to 5.21.5 (excl.) affected from 6.0.0 to 6.8.0 (excl.)

Credits

Miha Purg finder

References

Problem Types

CWE-915 Improperly controlled modification of Dynamically-Determined object attributes CWE