What is the CVSS score of CVE-2026-34179?

CVE-2026-34179 has a CVSS 3.1 base score of 9.1 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2026-34179?

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. Within 30 days: audit TLS certificate permissions and implement least-privilege access controls; review cluster access logs for any certificate-based authentication activity during the vulnerability window.

Lxd CVE-2026-34179

Q: Which versions of Lxd are affected by CVE-2026-34179?

CVE-2026-34179 is a critical privilege escalation flaw in Canonical LXD versions 4.12-6.7 that allows authenticated users with restricted TLS certificate permissions to escalate to cluster…. A patch is available.

EUVD-2026-20876 CRITICAL

Improperly Controlled Modification of Dynamically-Determined Object Attributes (CWE-915)

2026-04-09 canonical

GHSA-c3h3-89qf-jqm5

Privilege Escalation Canonical Lxd

9.1

CVSS 3.1 · Vendor: canonical

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Authenticate as restricted TLS certificate user
Delivery

Send PUT/PATCH request to /1.0/certificates/{fingerprint}
Exploit

Omit Type field validation in doCertificateUpdate
Execution

Escalate privileges to cluster admin
Impact

Gain high-impact access across system

Vulnerability Assessment

Weakness	CWE CWE-915 OWASP Top 10:2025 A08:2025 - Software or Data Integrity Failures ASVS 5.0 V4 - API and Web Service Object attribute protection
Exploitation Conditions	Canonical LXD 4.12–6.7 with TLS certificate authentication enabled. Attacker must be authenticated as a restricted TLS certificate user and send PUT/PATCH requests to /1.0/certificates/{fingerprint} endpoint to escalate to cluster admin privileges.
Impact	High-impact privilege escalation in LXD affecting versions 4.12-6.7. Requires authenticated access (high privilege), but achieves cluster admin escalation with full confidentiality, integrity, and availability compromise across infrastructure. Patch availability reduces urgency. EPSS and KEV status unknown; real-world priority depends on LXD exposure in Kubernetes/containerized environments and patch adoption rates.
Exploit ScenarioDerived	Authenticated cluster user with restricted TLS certificate permissions sends PUT/PATCH request to /1.0/certificates/{fingerprint}, omitting Type field validation in doCertificateUpdate. Attacker modifies certificate metadata to escalate to cluster admin. No public exploit code identified at time of analysis.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Apr 09, 2026

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. The vulnerability stems from missing Type field validation in doCertificateUpdate function when processing PUT/PATCH requests to the certificates API endpoint. Attack scope is changed (S:C), allowing attackers to break containment and achieve full cluster compromise with high impact to confidentiality, integrity, and availability. No public exploit identified at time of analysis.

RemediationAI

Vendor-released patch: upstream fix available via GitHub pull request (https://github.com/canonical/lxd/pull/17936); released patched version not independently confirmed at time of analysis. Organizations should monitor Canonical's official security advisory (https://github.com/canonical/lxd/security/advisories/GHSA-c3h3-89qf-jqm5) for release announcements and apply updates immediately upon availability. As an interim mitigation, restrict network access to the LXD API endpoint /1.0/certificates/* to trusted networks only, implement additional authentication layers for certificate management operations, audit existing TLS certificate users for appropriate privilege levels, and revoke restricted certificates if cluster admin escalation risk is unacceptable. Enable comprehensive API request logging to detect unauthorized certificate modification attempts.

Affected VersionsENISA

LXD 5.1.0 <5.21.5

LXD 6.0.0 <6.8.0

LXD 4.12.0 <5.0.7

Affected Packages

go github.com/canonical/lxd no fix

euvd lxd fix: 5.0.7, 5.21.5, 6.8.0

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 2 packages in go, euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The doCertificateUpdate function in lxd/certificates.go fails to validate the Type field during certificate modification operations. This CWE-915 (improperly controlled modification of dynamically-determined object attributes) flaw allows authenticated restricted certificate users to manipulate certificate properties via PUT/PATCH to /1.0/certificates/{fingerprint}, bypassing intended access controls and elevating to cluster administrator role. Network-accessible (AV:N), low complexity (AC:L), requiring high privileges (PR:H).

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (canonical) PRIMARY 9.1 CRITICAL

AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

SUSE CRITICAL

Primary rating from Vendor (canonical).

CVSS VectorVendor: canonical

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Apr 09, 2026 - 09:30 nvd

Patch available

CVE Published

Apr 09, 2026 - 09:22 nvd

CRITICAL 9.1

DescriptionCVE.org

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.

Executive ViewAI

Why It Matters

CVE-2026-34179 is a critical privilege escalation flaw in Canonical LXD versions 4.12-6.7 that allows authenticated users with restricted TLS certificate permissions to escalate to cluster administrator privileges, potentially compromising all container infrastructure and data within the LXD cluster. Organizations running affected LXD versions must prioritize patching to prevent lateral movement and full infrastructure takeover by adversaries with initial certificate-level access.

Business Impact: Severe

Compensating Controls

Apply vendor patch. Until patching is complete: restrict TLS certificate issuance to essential use cases only; implement network segmentation to limit which users/systems can authenticate to LXD cluster endpoints; monitor PUT/PATCH requests to the certificates API endpoint for anomalous activity; disable non-essential certificate-based authentication methods where operationally feasible.

Threat Intelligence Overview

EPSS Score

0.1%

Top 75% exploitable

Threat Intel

1 source

Social Media

Sightings

Data Quality

7 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment GHSA Vendor CIRCL

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC No

EPSS 0.1%

Patch available Yes

Active threat No

Deciding rule

CRITICAL severity

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision

Out-of-Cycle

Exploitation

Poc

System Exposure· derived

Open

Automatable

Human Impact

Very High

Technical Impact

Total

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +46

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.