CVE-2026-34179

EUVD-2026-20876
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.1 CRITICAL
NETWORK
LOW
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 19.87%
Affected Products (NVD)
VendorProductVersion
canonicallxd
4.12 ≤
𝑥
≤ 5.0.6
canonicallxd
5.21.0 ≤
𝑥
≤ 5.21.4
canonicallxd
6.0 ≤
𝑥
≤ 6.7
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
incus
forky
7.0.1-2
fixed
sid
7.0.1-2
fixed
trixie
6.0.4-2+deb13u8
fixed
trixie (security)
6.0.4-2+deb13u9
fixed
lxd
bookworm
vulnerable
bookworm (security)
vulnerable
trixie
5.0.2+git20231211.1364ae4-9+deb13u7
fixed
trixie (security)
5.0.2+git20231211.1364ae4-9+deb13u7
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
incus
jammy
dne
noble
needed
questing
ignored
resolute
needed
lxd
bionic
not-affected
focal
not-affected
jammy
dne
noble
dne
questing
dne
resolute
dne
xenial
not-affected
Common Weakness Enumeration
References
https://github.com/canonical/lxd/pull/17936
https://github.com/canonical/lxd/security/advisories/GHSA-c3h3-89qf-jqm5
https://github.com/canonical/lxd/security/advisories/GHSA-c3h3-89qf-jqm5