CVE-2026-34178
Importing a crafted backup leads to project restriction bypass
- State
- Published
- Severity
- 9.1 Critical
- Published
- Apr 9, 2026
- Updated
- Apr 9, 2026
- Reserved
- Mar 26, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H | canonical |
Weaknesses
- CWE-20 Improper input validation
Affected Products
| Product | Versions |
|---|---|
lxdCanonical |
|
References
- Importing a crafted backup leads to project restriction bypassvdb-entryvendor-advisory
- Import: Create backup config from indexpatchissue-tracking
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