PYSEC-2026-1452
Vulnerability from pysec - Published: 2026-07-07 14:34 - Updated: 2026-07-07 17:24
VLAI
Details
Summary
Problem: Potential man-in-the-middle attacks due to missing SSL certificate verification in the project codebase and used third-party libraries.
Details
In the past, aiohttp-session/request had the parameter verify_ssl to control SSL certificate verification. This was a boolean value. In aiohttp 3.0, this parameter was deprecated in favor of the ssl parameter. Only when ssl is set to None or provided with a correct configured SSL context the standard SSL certificate verification will happen.
When migrating integrations in Home Assistant and libraries used by Home Assistant, in some cases the verify_ssl parameter value was just moved to the new ssl parameter. This resulted in these integrations and 3rd party libraries using request.ssl = True, which unintentionally turned off SSL certificate verification and opened up a man-in-the-middle attack vector.
Example: https://github.com/home-assistant/core/blob/c4411914c2e906105b765c00af5740bd0880e946/homeassistant/components/discord/notify.py#L84
When you scan the libraries used by the integrations in Home Assistant, you will find more issues like this.
The general handling in Home Assistant looks good, as homeassistant.helpers.aoihttp_client._async_get_connector handles it correctly.
PoC
- Check that expired.badssl.com:443 gives an SSL error in when connecting with curl or browser.
- Add the integration adguard with the setting
host=expired.badssl.com,port=443,use-ssl=true,verify-ssl=true. - Check the logs - you get a HTTP 403 response.
Expected behavior:
1. The integration log shows an ssl.SSLCertVerificationError.
The following code shows the problem with ssl=True. No exception is raised when ssl=True (Python 3.11.6).
import asyncio
from ssl import SSLCertVerificationError
import aiohttp
BAD_URL = "https://expired.badssl.com/"
async def run_request(verify_ssl, result_placeholder: str):
async with aiohttp.ClientSession() as session:
exception_fired: bool = False
try:
await session.request("OPTIONS", BAD_URL, ssl=verify_ssl)
except SSLCertVerificationError:
exception_fired = True
except Exception as error:
print(error)
else:
exception_fired = False
print(result_placeholder.format(exception_result=exception_fired))
# Case 1: ssl=False --> expected result: No exception
asyncio.run(run_request(False, "Test case 1: expected result: False - result: {exception_result}"))
# Case 2: ssl=None --> expected result: Exception
asyncio.run(run_request(None, "Test case 2: expected result: True - result: {exception_result}"))
# Case 3: ssl=True --> expected result: No Exception
asyncio.run(run_request(True, "Test case 3: expected result: False - result: {exception_result}"))
Severity
7.0 (High)
Impacted products
| Name | purl | homeassistant | pkg:pypi/homeassistant |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "homeassistant",
"purl": "pkg:pypi/homeassistant"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2024.1.6"
}
],
"type": "ECOSYSTEM"
}
],
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}
],
"aliases": [
"CVE-2025-25305",
"GHSA-m3pm-rpgg-5wj6"
],
"details": "## Summary\n\nProblem: Potential man-in-the-middle attacks due to missing SSL certificate verification in the project codebase and used third-party libraries.\n\n## Details\n\nIn the past, `aiohttp-session`/`request` had the parameter `verify_ssl` to control SSL certificate verification. This was a boolean value. In `aiohttp` 3.0, this parameter was deprecated in favor of the `ssl` parameter. Only when `ssl` is set to `None` or provided with a correct configured SSL context the standard SSL certificate verification will happen.\n\nWhen migrating integrations in Home Assistant and libraries used by Home Assistant, in some cases the `verify_ssl` parameter value was just moved to the new `ssl` parameter. This resulted in these integrations and 3rd party libraries using `request.ssl = True`, which unintentionally turned off SSL certificate verification and opened up a man-in-the-middle attack vector.\n\nExample:\nhttps://github.com/home-assistant/core/blob/c4411914c2e906105b765c00af5740bd0880e946/homeassistant/components/discord/notify.py#L84\n\nWhen you scan the libraries used by the integrations in Home Assistant, you will find more issues like this.\n\nThe general handling in Home Assistant looks good, as `homeassistant.helpers.aoihttp_client._async_get_connector` handles it correctly.\n\n## PoC\n\n1. Check that expired.badssl.com:443 gives an SSL error in when connecting with curl or browser.\n2. Add the integration adguard with the setting `host=expired.badssl.com`, `port=443`, `use-ssl=true`, `verify-ssl=true`.\n3. Check the logs - you get a HTTP 403 response.\n\nExpected behavior:\n1. The integration log shows an `ssl.SSLCertVerificationError`.\n\nThe following code shows the problem with `ssl=True`. No exception is raised when `ssl=True` (Python 3.11.6).\n\n```\nimport asyncio\nfrom ssl import SSLCertVerificationError\n\nimport aiohttp\n\nBAD_URL = \"https://expired.badssl.com/\"\n\n\nasync def run_request(verify_ssl, result_placeholder: str):\n async with aiohttp.ClientSession() as session:\n exception_fired: bool = False\n try:\n await session.request(\"OPTIONS\", BAD_URL, ssl=verify_ssl)\n except SSLCertVerificationError:\n exception_fired = True\n except Exception as error:\n print(error)\n else:\n exception_fired = False\n print(result_placeholder.format(exception_result=exception_fired))\n\n\n# Case 1: ssl=False --\u003e expected result: No exception\nasyncio.run(run_request(False, \"Test case 1: expected result: False - result: {exception_result}\"))\n\n# Case 2: ssl=None --\u003e expected result: Exception\nasyncio.run(run_request(None, \"Test case 2: expected result: True - result: {exception_result}\"))\n\n# Case 3: ssl=True --\u003e expected result: No Exception\nasyncio.run(run_request(True, \"Test case 3: expected result: False - result: {exception_result}\"))\n\n```",
"id": "PYSEC-2026-1452",
"modified": "2026-07-07T17:24:18.733511Z",
"published": "2026-07-07T14:34:49.937813Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/home-assistant/core/security/advisories/GHSA-m3pm-rpgg-5wj6"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-25305"
},
{
"type": "WEB",
"url": "https://github.com/home-assistant/core/commit/8c6547f1b64f4a3d9f10090b97383353c9367892"
},
{
"type": "PACKAGE",
"url": "https://github.com/home-assistant/core"
},
{
"type": "PACKAGE",
"url": "https://pypi.org/project/homeassistant"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-m3pm-rpgg-5wj6"
}
],
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L",
"type": "CVSS_V3"
}
],
"summary": "Home Assistant does not correctly validate SSL for outgoing requests in core and used libs"
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
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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.