CVE-2026-63294

EUVD-2026-57538

12.08.2026, 20:17

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.

Link Following

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
canonical	CNA	9.9 CRITICAL	NETWORK	LOW	LOW	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
canonical	lxd	4.0.0 ≤ 𝑥 < 4.0.12	CNA
canonical	lxd	5.0.0 ≤ 𝑥 < 5.0.8	CNA
canonical	lxd	5.21.0 ≤ 𝑥 < 5.21.6	CNA
canonical	lxd	6.0 ≤ 𝑥 < 6.10	CNA

Common Weakness Enumeration

CWE-59 - Improper Link Resolution Before File Access ('Link Following')
The software 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

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