CVE-2026-50269

Full vulnerability record from the local CVENow database.

Description

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

LOW

CVSS score

2.7 (v4.0)

Vulnerability status

Analyzed

Source identifier

[email protected]

Published

2026-06-22 18:16:42.920000

Last modified

2026-10-25 23:10:00.167000

View original CVE JSON

{
  "id": "CVE-2026-50269",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-22T18:16:42.920",
  "lastModified": "2026-10-25T23:10:00.167",
  "vulnStatus": "Analyzed",
  "cveTags": [],
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      "value": "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."
    },
    {
      "lang": "es",
      "value": "AIOHTTP es un framework HTTP cliente/servidor asíncrono para asyncio y Python. Antes de 3.14.0, la entrada controlada por el atacante incluida en las cabeceras multipart/payload puede usarse para modificar una solicitud e inyectar cabeceras adicionales o similares. En la improbable situación de que una aplicación esté pasando cadenas controladas por el usuario a MultipartWriter.append(headers=...) o Payload.headers, entonces un atacante podría modificar la solicitud para inyectar cabeceras o cambiar el contenido de la solicitud. Esta vulnerabilidad está corregida en 3.14.0."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "aio-libs",
          "product": "aiohttp",
          "versions": [
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              "version": "< 3.14.0",
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          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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          "valueDensity": "NOT_DEFINED",
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    "ssvcV203": [
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      "url": "https://github.com/aio-libs/aiohttp/commit/bf88077ebb14f4c29924b8e8904cba20c55c28b8",
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}