SB20260825137 - Relative Path Traversal in LXD

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Main Vulnerability Database SB20260825137

SB20260825137 - Relative Path Traversal in LXD

Published: August 25, 2026

Security Bulletin ID SB20260825137
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Relative Path Traversal (CVE-ID: CVE-2026-66897)

CWE-ID: CWE-23 - Relative Path Traversal

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to write arbitrary files on the host as root.

The vulnerability exists due to path traversal in instance template handling when processing attacker-controlled template target paths from metadata.yaml. A remote user can supply a specially crafted template path to write arbitrary files on the host as root.

No non-default configuration is needed. The issue can be reached through API metadata updates by a user with can_edit permission on a container, and it can also be reached by launching a crafted image.


Remediation

Install update from vendor's website.

References