---
title: "CVE-2026-64825: Home Assistant Core vulnerable to Path Traversal via backup upload during onboarding"
url: https://erroneo.us/security/cve/CVE-2026-64825/
description: "CVE-2026-64825 (homeassistant (PyPI)): Home Assistant Core before 2026.6.0 contains a path traversal vulnerability that allows unauthenticated attackers to…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-07-21
date_modified: 2026-10-08
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-64825"
kev: false
cvss: 9
epss: 0.0058
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-64825: Home Assistant Core vulnerable to Path Traversal via backup upload during onboarding

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.6% , percentile 47: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 47% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes homeassistant (PyPI) < 2026.6.0, fixed in 2026.6.0 . Check your lockfile, including transitive dependencies.

## What it is

Home Assistant Core before 2026.6.0 contains a path traversal vulnerability that allows unauthenticated attackers to write arbitrary files to any directory on the host filesystem by uploading a crafted backup archive during the initial onboarding window. Attackers can manipulate the 'name' field inside the uploaded archive's backup.json to supply an absolute path, causing pathlib.Path.truediv to discard the configured backup directory prefix and write attacker-controlled content to arbitrary locations, with full filesystem access when the process runs as root.

## Affected packages

- PyPI `homeassistant` < 2026.6.0 → fixed: 2026.6.0

## Affected products (CVE record)

- home-assistant Home Assistant Core: < 2026.6.0

## Severity

- VulnCheck CVSS 4.0: 9 `CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L`
- VulnCheck CVSS 3.1: 9.3 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L`
- GitHub CVSS 4.0: 9.0 `CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.58% probability of exploitation activity in the next 30 days; percentile 47.

## Sources

- [Release Notes](https://github.com/home-assistant/core/releases/tag/2026.6.0)
- [Patch Commit](https://github.com/home-assistant/core/commit/567fe858289876b68b8162a77bd46e1e1af79752)
- [GitHub Advisory GHSA-5hxg-r395-fqxx](https://github.com/advisories/GHSA-5hxg-r395-fqxx)
- [CVE.org record CVE-2026-64825](https://www.cve.org/CVERecord?id=CVE-2026-64825)
- [NVD entry CVE-2026-64825](https://nvd.nist.gov/vuln/detail/CVE-2026-64825)
- [Pull Request](https://github.com/home-assistant/core/pull/172368)
- [vulncheck.com](https://www.vulncheck.com/advisories/home-assistant-core-path-traversal-file-write-via-backup-upload)

---
Source page: https://erroneo.us/security/cve/CVE-2026-64825/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt