CVE-2026-50269
AIOHTTP: CRLF injection in multipart headers
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.
INFO
Published Date :
June 22, 2026, 4:30 p.m.
Last Modified :
June 22, 2026, 4:30 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Solution
- Update AIOHTTP to version 3.14.0 or later.
- Avoid passing user-controlled strings into MultipartWriter.append(headers=...)
- Avoid passing user-controlled strings into Payload.headers.
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