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CVE-2024-52304 — aiohttp vulnerable to request smuggling due to incorrect parsing of chunk extensions

2026-09-29T22:41:01.789592+00:00

Affected: aio-libs aiohttp, python aiohttp

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.10.11, the Python parser parses newlines in chunk extensions incorrectly which can lead to request smuggling vulnerabilities under certain conditions. 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. Version 3.10.11 fixes the issue.

GHSA-8495-4g3g-x7pr — aiohttp allows request smuggling due to incorrect parsing of chunk extensions

2026-09-29T22:41:01.789739+00:00

Affected: PyPI: aiohttp

### 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

PYSEC-2026-1103 — aiohttp allows request smuggling due to incorrect parsing of chunk extensions

2026-09-29T22:41:01.789801+00:00

Affected: PyPI: aiohttp

### Summary The Python parser parses newlines in chunk extensions incorrectly which can lead to request smuggling vulnerabilities under certain conditions.

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Patch: https://github.com/aio-libs/aiohttp/commit/259edc369075de63e6f3a4eaade058c62af0df71