CVE-2026-34179

Critical

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.

SeverityCritical

CVSS9.1

Exploit probability—

ProductCanonical Lxd

PublishedApr 9, 2026

First seenApr 9, 2026

Weakness typeCWE-915CWE-915

How to fix

Patches

github.com/canonical/lxd/pull/17936

Vendor advisories

github.com/canonical/lxd/security/advisories/GHSA-c3h3-89qf-jqm5

Affected products

Product	Affected versions	Fixed in
canonical lxd	4.12 ≤ v ≤ 5.0.6, 5.21.0 ≤ v ≤ 5.21.4, 6.0 ≤ v ≤ 6.7	—
github.com/canonical/lxdGo	0.0.0-20210305023314-538ac3df036e ≤ v ≤ 0.0.0-20260226085519-736f34afb267, No range specified	—

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