What is CVE-2026-66898?

CVE-2026-66898 is a critical-severity vulnerability in Canonical Lxd, classified under Path Traversal. CVSS score: 9.9/10. Published 2026-08-12.

How severe is CVE-2026-66898?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Path Traversal in Canonical Lxd

CVE-2026-66898

A path traversal vulnerability in LXD allows an attacker to manipulate file system paths during backup import and restore operations. When importing or restoring a backup archive, LXD fails to validate instance and storage volume names con…

Vulnerability class: Path Traversal (Directory Traversal)

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Canonical Lxd — versions 4.0.0, 5.0.0, 5.21.0

Weakness classification (CWE)

CWE-22 — Path Traversal

References

security@ubuntu.com (vendor-advisory, vdb-entry)

Frequently asked questions

What is CVE-2026-66898?: CVE-2026-66898 is a critical-severity vulnerability in Canonical Lxd, classified under Path Traversal. CVSS score: 9.9/10. Published 2026-08-12.
How severe is CVE-2026-66898?: Critical severity. CVSS v3 base score is 9.9 out of 10.