CVE-2026-34178

Summary

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.

Affected Software

VendorProductVersion RangeStatus
Canonicallxd4.12.0 < 5.0.7affected
Canonicallxd5.1.0 < 5.21.5affected
Canonicallxd6.0.0 < 6.8.0affected

Weaknesses

  • CWE-20: CWE-20 Improper input validation

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: no
    • Technical Impact: total

Additional References

References