CVEvulnerability

CVE-2026-66897

9.9 CRITICAL Published 2026-08-24 Modified 2026-10-24 Official page ↗
Status
Analyzed
Published
2026-08-24
Last modified
2026-10-24
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.9 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weaknesses
CWE-22, CWE-23

Description

A path traversal vulnerability in LXD's instance template processing allows an attacker with container edit permissions, or any user launching a crafted image, to overwrite arbitrary files on the host system as root. When processing target template paths specified in metadata.yaml, LXD validates the path against a confined os.Root directory handle but subsequently opens and creates the file using os.Create with an unconfined string path. This discrepancy between path resolution checks and file creation allows an attacker to escape directory confinement, overwrite root-owned host files, and achieve host root code execution.

Affected configurations

• canonical lxd (< 4.0.13) • canonical lxd (>= 5.0.0 < 5.0.9) • canonical lxd (>= 5.1 < 5.21.7) • canonical lxd (>= 6.0 <= 6.9)

Related

Weakness · CWE (2)

  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory weakness
  • CWE-23 Relative Path Traversal weakness

References