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.

The version of the aiohttp Python library installed on the remote host is prior to 3.14.0. It is, therefore, affected by a vulnerability:

  - 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. (CVE-2026-50269)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-50269)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-50269)

ID	Name	Product	Family	Severity
324957	Python Library aiohttp < 3.14.0 Header Injection	Nessus	Misc.	medium
322127	Linux Distros Unpatched Vulnerability : CVE-2026-50269	Nessus	Misc.	medium
443263	SCA: security update for aiohttp (GHSA-m6qw-4cw2-hm4m)	Tenable Cloud Security	SCA Checks	medium
443263	SCA: security update for aiohttp (GHSA-m6qw-4cw2-hm4m)	Tenable Self-Hosted Container Security	SCA Checks	medium

Detections

Analytics

CVE-2026-50269

medium

Tenable Plugins

medium

medium

medium

medium