aiohttp allows request smuggling due to incorrect parsing of chunk extensions
### Summary
The Python parser parses newlines in chunk extensions incorrectly which can lead to request smuggling vulnerabilities under certain conditions.
### Impact
If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or `AIOHTTP_NO_EXTENSIONS` is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections.
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Patch:
https://github.com/aio-libs/aiohttp/commit/259edc369075de63e6f3a4eaade058c62af0df71