CVE-2023-37276

aiohttp is an asynchronous HTTP client/server framework for asyncio and
Python. aiohttp v3.8.4 and earlier are bundled with llhttp v6.0.6.
Vulnerable code is used by aiohttp for its HTTP request parser when
available which is the default case when installing from a wheel. This
vulnerability only affects users of aiohttp as an HTTP server (ie
aiohttp.Application), you are not affected by this vulnerability if you
are using aiohttp as an HTTP client library (ie aiohttp.ClientSession).
Sending a crafted HTTP request will cause the server to misinterpret one of
the HTTP header values leading to HTTP request smuggling. This issue has
been addressed in version 3.8.5. Users are advised to upgrade. Users unable
to upgrade can reinstall aiohttp using AIOHTTP_NO_EXTENSIONS=1 as an
environment variable to disable the llhttp HTTP request parser
implementation. The pure Python implementation isn’t vulnerable.