What is CVE-2026-34178?

CVE-2026-34178 is a critical-severity vulnerability in Canonical Lxd, classified under Improper Input Validation. CVSS score: 9.1/10. Published 2026-04-09.

How severe is CVE-2026-34178?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Improper input validation in Canonical Lxd

CVE-2026-34178

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 i…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.001 (21.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

Affected products

Canonical Lxd — versions 4.12.0, 5.1.0, 6.0.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

Importing a crafted backup leads to project restriction bypass (vdb-entry, vendor-advisory)
Import: Create backup config from index (patch, issue-tracking)

Frequently asked questions

What is CVE-2026-34178?: CVE-2026-34178 is a critical-severity vulnerability in Canonical Lxd, classified under Improper Input Validation. CVSS score: 9.1/10. Published 2026-04-09.
How severe is CVE-2026-34178?: Critical severity. CVSS v3 base score is 9.1 out of 10.