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
NIST	Primary	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: 57.42%

Affected Products (NVD)

Vendor	Product	Version
canonical	lxd	4.0.0 ≤ 𝑥 < 4.0.12
canonical	lxd	5.0.0 ≤ 𝑥 < 5.0.8
canonical	lxd	5.1 ≤ 𝑥 < 5.21.6
canonical	lxd	6.0 ≤ 𝑥 < 6.10

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

lxd

bookworm	vulnerable
bookworm (security)	vulnerable
trixie	vulnerable
trixie (security)	vulnerable

Ubuntu Releases

Ubuntu Product

Codename

lxd

bionic	needs-triage
focal	needs-triage
jammy	dne
noble	dne
resolute	dne
xenial	needs-triage

Known Exploits!

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