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Moderate severityNVD Advisory· Published Nov 18, 2024· Updated Nov 3, 2025

aiohttp vulnerable to request smuggling due to incorrect parsing of chunk extensions

CVE-2024-52304

Description

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
aiohttpPyPI
< 3.10.113.10.11

Affected products

65

Patches

Vulnerability mechanics

References

5

News mentions

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