Canonical LXD 4.126.7: Type Field Bypass Admin Escalation (CVE202634179)
CVE-2026-34179 Published on April 9, 2026
Update of type field in restricted TLS certificate allows privilege escalation to cluster admin
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.
Vulnerability Analysis
CVE-2026-34179 can be exploited with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2026-34179. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
What is a Mass Assignment Vulnerability?
The software receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified.
CVE-2026-34179 has been classified to as a Mass Assignment vulnerability or weakness.
Products Associated with CVE-2026-34179
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Affected Versions
Canonical lxd:- Version 4.12.0 and below 5.0.7 is affected.
- Version 5.1.0 and below 5.21.5 is affected.
- Version 6.0.0 and below 6.8.0 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.