CVE-2026-34179Public exploitNetwork attack vector

Cluster-admin escalation via mutable certificate type

Published Apr 9, 2026 · Updated Apr 9, 2026

Privilege escalation in Canonical LXD 4.12 through 6.7 allows remote authenticated users with restricted TLS certificates to become cluster admins. The doCertificateUpdate handler accepts a caller-controlled Type field on PUT or PATCH requests and stores server instead of retaining the certificate's original client type. A project-scoped restricted certificate is required; the new server-certificate identity persists, grants full cluster administration, and enables host compromise through privileged containers.

CVSS severity9.1
Critical
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in Canonical LXD 4.12 through 6.7 allows remote authenticated users with restricted TLS certificates to become cluster admins. The doCertificateUpdate handler accepts a caller-controlled Type field on PUT or PATCH requests and stores server instead of retaining the certificate's original client type. A project-scoped restricted certificate is required; the new server-certificate identity persists, grants full cluster administration, and enables host compromise through privileged containers.

The record

CVE
CVE-2026-34179
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
Canonical
Product
LXD
Classifications
CWE-915, T1098.006
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.12.0 <5.0.7
  2. Affected versionversion=5.1.0 <5.21.5
  3. Affected versionversion=6.0.0 <6.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Canonical · LXDversion=4.12.0 <5.0.7; version=5.1.0 <5.21.5; version=6.0.0 <6.8.0

Published CVSS scores

9.1Canonical Ltd.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-915Improperly Controlled Modification of Dynamically-Determined Object Attributes
T1098.006Additional Container Cluster Roles

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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