---
title: "CVE-2026-85185: Canonical LXD - Path Traversal"
description: "Canonical LXD 4.0.2 and later contain a path traversal in the btrfs storage driver caused by crafted subvolume paths with ../ sequences, letting authenticated clients with instance creation permission delete or write arbitrary files as root, exploit requires authenticated client with instance creation permission."
url: https://panop.io/threat-heartbeat/CVE-2026-85185/
---

# CVE-2026-85185 Canonical LXD - Path Traversal

Canonical LXD 4.0.2 and later contain a path traversal in the btrfs storage driver caused by crafted subvolume paths with ../ sequences, letting authenticated clients with instance creation permission delete or write arbitrary files as root, exploit requires authenticated client with instance creation permission.

CVSS base score 9.6 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.36% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-85185)

## Details

Type

Path Traversal

Impact

File System Write, Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H

Published

28 September 2026

Updated

15 October 2026

Weakness

[CWE-22](https://cwe.mitre.org/data/definitions/22.html)

## Vendor fix

Update to versions 4.0.14, 5.0.10, 5.21.8, 6.10 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-85185](https://nvd.nist.gov/vuln/detail/CVE-2026-85185)
- [https://github.com/canonical/lxd/security/advisories/GHSA-27q7-qwhm-c34p](https://github.com/canonical/lxd/security/advisories/GHSA-27q7-qwhm-c34p)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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