CVE-2026-63294

Critical

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.

SeverityCritical

CVSS9.9

Exploit probability—

ProductCanonical Lxd

PublishedAug 12, 2026

First seenAug 12, 2026

Weakness typeCWE-59Improper link resolution

How to fix

Update

canonical lxd4.0.12, 5.0.8, 5.21.6, 6.10 or later

Vendor advisories

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

Affected products

Product	Affected versions	Fixed in
canonical lxd	4.0.0 ≤ v < 4.0.12, 5.0.0 ≤ v < 5.0.8, 5.1 ≤ v < 5.21.6, 6.0 ≤ v < 6.10	4.0.12, 5.0.8, 5.21.6, 6.10

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