Critical severity · published Apr 9, 2026
CVE-2026-34179
Update of type field in restricted TLS certificate allows privilege escalation to cluster admin
9.1
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LX
lxd · Canonical
4.12.0 before 5.0.7; 5.1.0 before 5.21.5; 6.0.0 before 6.8.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34179
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-34179
Issue Tracking
https://github.com/canonical/lxd/pull/17936
Exploit
https://github.com/canonical/lxd/security/advisories/GHSA-c3h3-89qf-jqm5
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