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VULNERABILITIES

CVE-2026-34178 Details

Description

In Canonical LXD before 6.8, the backup import path validates project restrictions against backup/index.yaml in the supplied tar archive but creates the instance from backup/container/backup.yaml, a separate file in the same archive that is never checked against project restrictions. An authenticated remote attacker with instance-creation permission in a restricted project can craft a backup archive where backup.yaml carries restricted settings such as security.privileged=true or raw.lxc directives, bypassing all project restriction enforcement and allowing full host compromise.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/canonical/lxd/security/advisories/GHSA-q96j-3fmm-7fv4 CISA-ADPExploitThird Party Advisory
https://github.com/canonical/lxd/pull/17921 [email protected]Issue Tracking
https://github.com/canonical/lxd/security/advisories/GHSA-q96j-3fmm-7fv4 [email protected]ExploitThird Party Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-20Improper Input Validation[email protected]

Affected Products

ProductVersions
canonical lxd
>= 4.12, <= 5.0.6
>= 5.21.0, <= 5.21.4
>= 6.0, <= 6.7

CPE

  • cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

5 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-34178
NVD Published Date:
Apr 9, 2026
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2026-34178 Details - Not Deferred