PYSEC-2026-3669
Vulnerability from pysec - Published: 2026-08-19 11:56 - Updated: 2026-08-19 12:16
VLAI
Details
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.
Severity
9.3 (Critical)
Impacted products
| Name | purl | homeassistant | pkg:pypi/homeassistant |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "homeassistant",
"purl": "pkg:pypi/homeassistant"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2026.6.0"
}
],
"type": "ECOSYSTEM"
}
],
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"2025.9.0b6",
"2025.9.1",
"2025.9.2",
"2025.9.3",
"2025.9.4",
"2026.1.0",
"2026.1.0b0",
"2026.1.0b1",
"2026.1.0b2",
"2026.1.0b3",
"2026.1.0b4",
"2026.1.0b5",
"2026.1.1",
"2026.1.2",
"2026.1.3",
"2026.2.0",
"2026.2.0b0",
"2026.2.0b1",
"2026.2.0b2",
"2026.2.0b3",
"2026.2.0b4",
"2026.2.0b5",
"2026.2.1",
"2026.2.2",
"2026.2.3",
"2026.3.0",
"2026.3.0b0",
"2026.3.0b1",
"2026.3.0b2",
"2026.3.0b3",
"2026.3.0b4",
"2026.3.1",
"2026.3.2",
"2026.3.3",
"2026.3.4",
"2026.4.0",
"2026.4.0b0",
"2026.4.0b1",
"2026.4.0b10",
"2026.4.0b2",
"2026.4.0b3",
"2026.4.0b4",
"2026.4.0b5",
"2026.4.0b7",
"2026.4.0b8",
"2026.4.0b9",
"2026.4.1",
"2026.4.2",
"2026.4.3",
"2026.4.4",
"2026.5.0",
"2026.5.0b0",
"2026.5.0b1",
"2026.5.0b2",
"2026.5.0b3",
"2026.5.0b4",
"2026.5.1",
"2026.5.2",
"2026.5.3",
"2026.5.4",
"2026.6.0b0",
"2026.6.0b1",
"2026.6.0b2",
"2026.6.0b3",
"2026.6.0b4"
]
}
],
"aliases": [
"CVE-2026-64825",
"GHSA-5hxg-r395-fqxx"
],
"details": "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 \u0027name\u0027 field inside the uploaded archive\u0027s 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.",
"id": "PYSEC-2026-3669",
"modified": "2026-08-19T12:16:25.600932Z",
"published": "2026-08-19T11:56:25.207055Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64825"
},
{
"type": "WEB",
"url": "https://github.com/home-assistant/core/pull/172368"
},
{
"type": "WEB",
"url": "https://github.com/home-assistant/core/commit/567fe858289876b68b8162a77bd46e1e1af79752"
},
{
"type": "PACKAGE",
"url": "https://github.com/home-assistant/core"
},
{
"type": "WEB",
"url": "https://github.com/home-assistant/core/releases/tag/2026.6.0"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/home-assistant-core-path-traversal-file-write-via-backup-upload"
},
{
"type": "PACKAGE",
"url": "https://pypi.org/project/homeassistant"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-5hxg-r395-fqxx"
}
],
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:L",
"type": "CVSS_V3"
},
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "Home Assistant Core vulnerable to Path Traversal via backup upload during onboarding"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
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Vulnerability timeline
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.