Path Traversal in Canonical Lxd
CVE-2026-66898
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (46.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.002
Affected products
- Canonical Lxd — versions 4.0.0, 5.0.0, 5.21.0
Weakness classification (CWE)
References
- github.com/canonical/lxd/security/advisories/GHSA-m857-c7gc-c984 (Exploit, vendor-advisory, Mitigation, vdb-entry, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-66898?
- CVE-2026-66898 is a critical-severity vulnerability in Canonical Lxd, classified under Path Traversal. CVSS score: 9.9/10. Published 2026-08-12.
- How severe is CVE-2026-66898?
- Critical severity. CVSS v3 base score is 9.9 out of 10.