CVE-2026-63294

Published: Aug 12, 2026Modified: Sep 11, 2026

9.9

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Exploitability: 3.1 / Impact: 6.0

Source: security@ubuntu.com (Secondary)

Description

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 file when it exists as a symbolic link. An attacker can exploit this flaw by providing a malicious archive with a symlinked backup.yaml file, causing LXD to process unconfined configuration metadata and execute arbitrary commands with root privileges.

Affected (4)

Products: Canonical: Lxd

1 product

Configuration A

4 vulnerable

Vulnerable Software	Affected Versions
Canonical Lxd	4.0.0 ≤ version < 4.0.12
Canonical Lxd	5.0.0 ≤ version < 5.0.8
Canonical Lxd	5.1 ≤ version < 5.21.6
Canonical Lxd	6.0 ≤ version < 6.10

Related CWEs

Improper Link Resolution Before File Access ('Link Following')

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

References (2)

https://github.com/canonical/lxd/security/advisories/GHSA-fv82-v4fj-mm4m

Source: security@ubuntu.com

Third Party AdvisoryExploitMitigation

https://github.com/canonical/lxd/security/advisories/GHSA-fv82-v4fj-mm4m

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Third Party AdvisoryExploitMitigation

Timeline

No history available yet.