---
title: "CVE-2026-87799: Canonical LXD - Path Traversal"
description: "Canonical LXD >= 4.0 contains a path traversal caused by improper link resolution in migration receive path, letting authenticated clients or malicious migration sources write files as root, exploit requires instance or volume creation privileges."
url: https://panop.io/threat-heartbeat/CVE-2026-87799/
---

# CVE-2026-87799 Canonical LXD - Path Traversal

Canonical LXD >= 4.0 contains a path traversal caused by improper link resolution in migration receive path, letting authenticated clients or malicious migration sources write files as root, exploit requires instance or volume creation privileges.

CVSS base score 9.9 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.41% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-87799)

## Details

Type

Path Traversal

Impact

File System Write, Privilege Escalation

CVSS vector

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

Published

28 September 2026

Updated

15 October 2026

Weakness

[CWE-59](https://cwe.mitre.org/data/definitions/59.html)

## Vendor fix

Upgrade 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-2026-87799](https://nvd.nist.gov/vuln/detail/CVE-2026-87799)
- [https://github.com/canonical/lxd/security/advisories/GHSA-fmc3-3cpq-6whr](https://github.com/canonical/lxd/security/advisories/GHSA-fmc3-3cpq-6whr)

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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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