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CVE-2026-34178

Importing a crafted backup leads to project restriction bypass

Published: Apr 9, 2026Updated: Apr 22, 2026 Sources: CVE List NVD BDUCWE-20
NVD MITRE
9.1CVSSCRITICAL
EPSS Score
0.4%
Top 66.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-20

Affected Products

lxdcanonical
On-prem
Operating Systems / linux-distro
Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
UbuntuCanonical Ltd.
On-premOS
Operating Systems / linux-distro
LXDCanonical Ltd.
On-prem
Operating Systems / linux-distro
canonicalcommercialGBOperating Systemsaka canonical ltd.
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
ооо «ред софт»commercialRUOperating Systemsaka red soft
canonical ltd.commercialGBOperating Systemsaka canonical
and 1 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://github.com/canonical/lxd/pull/17921
github.com
https://github.com/canonical/lxd/security/advisories/GHSA-q96j-3fmm-7fv4
github.com
https://github.com/canonical/lxd/security/advisories/GHSA-q96j-3fmm-7fv4
github.com
and 5 more references View all →

Timeline

Published
Apr 9, 2026
Last Updated
Apr 22, 2026

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