PYSEC-2026-237
Vulnerability from pysec - Published: 2026-06-22 18:16 - Updated: 2026-06-27 10:27
VLAI
Details
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, the server_hostname TLS SNI check can be bypassed when an existing connection is reused. If an application makes multiple requests to the same domain, but with different per-request server_hostname parameters, then the later calls may succeed by reusing the existing connection when they should have been rejected due to the TLS SNI check. This vulnerability is fixed in 3.14.1.
Severity
7.5 (High)
Impacted products
| Name | purl | aiohttp | pkg:pypi/aiohttp |
|---|
Aliases
{
"affected": [
{
"ecosystem_specific": {},
"package": {
"ecosystem": "PyPI",
"name": "aiohttp",
"purl": "pkg:pypi/aiohttp"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.14.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.1",
"0.10.0",
"0.10.1",
"0.10.2",
"0.11.0",
"0.12.0",
"0.13.0",
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"0.14.0",
"0.14.1",
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"0.14.3",
"0.14.4",
"0.15.0",
"0.15.1",
"0.15.2",
"0.15.3",
"0.16.0",
"0.16.1",
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"0.16.3",
"0.16.4",
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"3.9.5"
]
}
],
"aliases": [
"CVE-2026-54275",
"GHSA-4m7w-qmgq-4wj5"
],
"details": "AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, the server_hostname TLS SNI check can be bypassed when an existing connection is reused. If an application makes multiple requests to the same domain, but with different per-request server_hostname parameters, then the later calls may succeed by reusing the existing connection when they should have been rejected due to the TLS SNI check. This vulnerability is fixed in 3.14.1.",
"id": "PYSEC-2026-237",
"modified": "2026-06-27T10:27:57.261885Z",
"published": "2026-06-22T18:16:46.010Z",
"references": [
{
"type": "ADVISORY",
"url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-4m7w-qmgq-4wj5"
}
],
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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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.
- 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.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- 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.
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