CVE-2026-66898

EUVD-2026-57545

12.08.2026, 21:17

A path traversal vulnerability in LXD allows an attacker to manipulate file system paths during backup import and restore operations. When importing or restoring a backup archive, LXD fails to validate instance and storage volume names contained within the archive metadata. An attacker can exploit this flaw by supplying a crafted backup archive with malicious instance or volume names containing path traversal sequences, potentially allowing file access or overwriting outside the designated restore directory.

Path Traversal

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: 46.11%

Affected Products (NVD)

Vendor	Product	Version
canonical	lxd	4.0.0 ≤ 𝑥 < 4.0.12
canonical	lxd	5.0.0 ≤ 𝑥 < 5.0.4
canonical	lxd	5.1 ≤ 𝑥 < 5.21.2
canonical	lxd	6.0

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-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

References

https://github.com/canonical/lxd/security/advisories/GHSA-m857-c7gc-c984