CVE-2026-66898

Critical

Description

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.

SeverityCritical

CVSS9.9

Exploit probability—

ProductCanonical Lxd

PublishedAug 12, 2026

First seenAug 12, 2026

Weakness typeCWE-22Path traversal

How to fix

Update

canonical lxd4.0.12, 5.0.4, 5.21.2 or later

Vendor advisories

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

Affected products

Product	Affected versions	Fixed in
canonical lxd	4.0.0 ≤ v < 4.0.12, 5.0.0 ≤ v < 5.0.4, 5.1 ≤ v < 5.21.2, 6.0	4.0.12, 5.0.4, 5.21.2

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