What is CVE-2026-63294?

CVE-2026-63294 is a critical-severity vulnerability in Canonical Lxd, classified under Improper Link Resolution Before File Access. CVSS score: 9.9/10. Published 2026-08-12.

How severe is CVE-2026-63294?

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

Vulnerability in Canonical Lxd

CVE-2026-63294

A link following vulnerability in LXD allows an attacker to achieve root command execution on the host system. During the import or unpacking of crafted image or backup archives, LXD fails to properly validate and confine the backup.yaml f…

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-59 — Improper Link Resolution Before File Access

References

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

Frequently asked questions

What is CVE-2026-63294?: CVE-2026-63294 is a critical-severity vulnerability in Canonical Lxd, classified under Improper Link Resolution Before File Access. CVSS score: 9.9/10. Published 2026-08-12.
How severe is CVE-2026-63294?: Critical severity. CVSS v3 base score is 9.9 out of 10.