Importing a crafted backup leads to project restriction bypass

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Summary

CVECVE-2026-34178
StatePUBLISHED
Assignercanonical
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-09 10:16:21 UTC
Updated2026-04-22 20:55:16 UTC
DescriptionIn 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.

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: 0.000520000 probability, percentile 0.160980000 (date 2026-04-15)

Problem Types: CWE-20 | CWE-20 CWE-20 Improper input validation

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Canonical Lxd All All All All
Application Canonical Lxd All All All All
Application Canonical Lxd All All All All

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/17921 [email protected] github.com Issue Tracking
github.com/canonical/lxd/security/advisories/GHSA-q96j-3fmm-7fv4 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Third Party Advisory, Exploit
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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