Vulnerability in Canonical Lxd
CVE-2026-34179
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 class: Mass Assignment
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (33.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Canonical Lxd — versions 4.12.0, 5.1.0, 6.0.0
Weakness classification (CWE)
References
- github.com/canonical/lxd/security/advisories/GHSA-c3h3-89qf-jqm5 (Exploit, vendor-advisory, Third Party Advisory, vdb-entry)
- github.com/canonical/lxd/pull/17936 (issue-tracking, Patch, patch, Issue Tracking)
Frequently asked questions
- What is CVE-2026-34179?
- CVE-2026-34179 is a critical-severity vulnerability in Canonical Lxd, classified under Improperly Controlled Modification of Dynamically-Determined Object Attributes. CVSS score: 9.1/10. Published 2026-04-09.
- How severe is CVE-2026-34179?
- Critical severity. CVSS v3 base score is 9.1 out of 10.