EUVD-2026-20876

| CVE-2026-34179 CRITICAL
2026-04-09 canonical GHSA-c3h3-89qf-jqm5
9.1
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Apr 09, 2026 - 09:30 vuln.today
EUVD ID Assigned
Apr 09, 2026 - 09:30 euvd
EUVD-2026-20876
Patch Released
Apr 09, 2026 - 09:30 nvd
Patch available
CVE Published
Apr 09, 2026 - 09:22 nvd
CRITICAL 9.1

Tags

Canonical Privilege Escalation Authentication Bypass Lxd

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.

Analysis

Privilege escalation in Canonical LXD 4.12 through 6.7 enables remote authenticated restricted TLS certificate users to gain cluster admin privileges. Exploitation requires high-privilege authentication (PR:H) but no user interaction. …

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Remediation

Within 24 hours: inventory all LXD deployments and identify instances running versions 4.12 through 6.7; verify current version via `lxd --version`. Within 7 days: apply vendor-released patch to upgrade all affected LXD instances to version 6.8 or later; test patched versions in non-production environments first and coordinate maintenance windows to minimize cluster downtime. …

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Priority Score

46
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +46
POC: 0

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EUVD-2026-20876 vulnerability details – vuln.today
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