PYSEC-2026-2106
Vulnerability from pysec - Published: 2026-06-22 18:16 - Updated: 2026-07-13 05:47
VLAI
Details
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.0, attacker-controlled input included into multipart/payload headers can be used to modify a request to inject additional headers or similar. In the unlikely situation that an application is passing user-controlled strings into MultipartWriter.append(headers=...) or Payload.headers, then an attacker may be able to modify the request to inject headers or change the contents of the request. This vulnerability is fixed in 3.14.0.
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": "3.14.0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.1",
"0.10.0",
"0.10.1",
"0.10.2",
"0.11.0",
"0.12.0",
"0.13.0",
"0.13.1",
"0.14.0",
"0.14.1",
"0.14.2",
"0.14.3",
"0.14.4",
"0.15.0",
"0.15.1",
"0.15.2",
"0.15.3",
"0.16.0",
"0.16.1",
"0.16.2",
"0.16.3",
"0.16.4",
"0.16.5",
"0.16.6",
"0.17.0",
"0.17.1",
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"0.17.4",
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"0.18.1",
"0.18.2",
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"0.18.4",
"0.19.0",
"0.2",
"0.20.0",
"0.20.1",
"0.20.2",
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"0.21.1",
"0.21.2",
"0.21.4",
"0.21.5",
"0.21.6",
"0.22.0",
"0.22.0a0",
"0.22.0b0",
"0.22.0b1",
"0.22.0b2",
"0.22.0b3",
"0.22.0b4",
"0.22.0b5",
"0.22.0b6",
"0.22.1",
"0.22.2",
"0.22.3",
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"1.1.5",
"1.1.6",
"1.2.0",
"1.3.0",
"1.3.1",
"1.3.2",
"1.3.3",
"1.3.4",
"1.3.5",
"2.0.0",
"2.0.0rc1",
"2.0.1",
"2.0.2",
"2.0.3",
"2.0.4",
"2.0.5",
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"2.1.0",
"2.2.0",
"2.2.1",
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"2.2.3",
"2.2.4",
"2.2.5",
"2.3.0",
"2.3.0a1",
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"2.3.1",
"2.3.10",
"2.3.1a1",
"2.3.2",
"2.3.2b2",
"2.3.2b3",
"2.3.3",
"2.3.4",
"2.3.5",
"2.3.6",
"2.3.7",
"2.3.8",
"2.3.9",
"3.0.0",
"3.0.0b0",
"3.0.0b1",
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"3.0.0b3",
"3.0.0b4",
"3.0.1",
"3.0.2",
"3.0.3",
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"3.0.5",
"3.0.6",
"3.0.7",
"3.0.8",
"3.0.9",
"3.1.0",
"3.1.1",
"3.1.2",
"3.1.3",
"3.10.0",
"3.10.0b1",
"3.10.0rc0",
"3.10.1",
"3.10.10",
"3.10.11",
"3.10.11rc0",
"3.10.2",
"3.10.3",
"3.10.4",
"3.10.5",
"3.10.6",
"3.10.6rc0",
"3.10.6rc1",
"3.10.6rc2",
"3.10.7",
"3.10.8",
"3.10.9",
"3.11.0",
"3.11.0b0",
"3.11.0b1",
"3.11.0b2",
"3.11.0b3",
"3.11.0b4",
"3.11.0b5",
"3.11.0rc0",
"3.11.0rc1",
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"3.11.1",
"3.11.10",
"3.11.11",
"3.11.12",
"3.11.13",
"3.11.14",
"3.11.15",
"3.11.16",
"3.11.17",
"3.11.18",
"3.11.2",
"3.11.3",
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"3.11.5",
"3.11.6",
"3.11.7",
"3.11.8",
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"3.12.0",
"3.12.0b0",
"3.12.0b1",
"3.12.0b2",
"3.12.0b3",
"3.12.0rc0",
"3.12.0rc1",
"3.12.1",
"3.12.10",
"3.12.11",
"3.12.12",
"3.12.13",
"3.12.14",
"3.12.15",
"3.12.1rc0",
"3.12.2",
"3.12.3",
"3.12.4",
"3.12.6",
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"3.12.8",
"3.12.9",
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"3.13.1",
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"3.13.3",
"3.13.4",
"3.13.5",
"3.2.0",
"3.2.1",
"3.3.0",
"3.3.0a0",
"3.3.1",
"3.3.2",
"3.3.2a0",
"3.4.0",
"3.4.0a0",
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"3.4.0b1",
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"3.6.0",
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"3.9.5"
]
}
],
"aliases": [
"CVE-2026-50269",
"GHSA-m6qw-4cw2-hm4m"
],
"details": "AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.0, attacker-controlled input included into multipart/payload headers can be used to modify a request to inject additional headers or similar. In the unlikely situation that an application is passing user-controlled strings into MultipartWriter.append(headers=...) or Payload.headers, then an attacker may be able to modify the request to inject headers or change the contents of the request. This vulnerability is fixed in 3.14.0.",
"id": "PYSEC-2026-2106",
"modified": "2026-07-13T05:47:36.135546Z",
"published": "2026-06-22T18:16:42.920Z",
"references": [
{
"type": "ADVISORY",
"url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-m6qw-4cw2-hm4m"
},
{
"type": "FIX",
"url": "https://github.com/aio-libs/aiohttp/commit/bf88077ebb14f4c29924b8e8904cba20c55c28b8"
}
],
"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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