Update of type field in restricted TLS certificate allows privilege escalation to cluster admin

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Summary

CVECVE-2026-34179
StatePUBLISHED
Assignercanonical
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-09 10:16:21 UTC
Updated2026-04-09 12:16:18 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS: 0.000870000 probability, percentile 0.250840000 (date 2026-04-09)

Problem Types: CWE-915 | CWE-915 CWE-915 Improperly controlled modification of Dynamically-Determined object attributes

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
3.1CNACVSS9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Canonical Lxd affected 4.12.0 5.0.7 semver Linux
CNA Canonical Lxd affected 5.1.0 5.21.5 semver Linux
CNA Canonical Lxd affected 6.0.0 6.8.0 semver Linux

References

ReferenceSourceLinkTags
github.com/canonical/lxd/pull/17936 [email protected] github.com
github.com/canonical/lxd/security/advisories/GHSA-c3h3-89qf-jqm5 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Miha Purg (en)

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