CVE-2026-34178
Last modified
CVE-2026-34178 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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.. EPSS estimates a 0.42% chance of exploitation in the next 30 days.
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:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Canonical | Lxd | >= 4.12, <= 5.0.6 |
| Canonical | Lxd | >= 5.21.0, <= 5.21.4 |
| Canonical | Lxd | >= 6.0, <= 6.7 |
References
- https://github.com/canonical/lxd/pull/17921Issue Tracking
- https://github.com/canonical/lxd/security/advisories/GHSA-q96j-3fmm-7fv4Exploit, Third Party Advisory
- https://github.com/canonical/lxd/security/advisories/GHSA-q96j-3fmm-7fv4Exploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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