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Moderate severityNVD Advisory· Published Jan 29, 2024· Updated Nov 3, 2025

aiohttp's HTTP parser (the python one, not llhttp) still overly lenient about separators

CVE-2024-23829

Description

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Security-sensitive parts of the Python HTTP parser retained minor differences in allowable character sets, that must trigger error handling to robustly match frame boundaries of proxies in order to protect against injection of additional requests. Additionally, validation could trigger exceptions that were not handled consistently with processing of other malformed input. Being more lenient than internet standards require could, depending on deployment environment, assist in request smuggling. The unhandled exception could cause excessive resource consumption on the application server and/or its logging facilities. This vulnerability exists due to an incomplete fix for CVE-2023-47627. Version 3.9.2 fixes this vulnerability.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
aiohttpPyPI
< 3.9.23.9.2

Affected products

27

Patches

Vulnerability mechanics

References

14

News mentions

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