AIKIDO-2026-675677
aiohttp is vulnerable to HTTP Request Smuggling
37
Low Risk
This Affects:
aiohttpTL;DR
The HTTP parsers mishandle an edge case in the WebSocket upgrade procedure, leaving them inconsistent with how downstream agents interpret the same request. When the server-side component is used, an attacker can abuse this inconsistency to smuggle an additional request past an intermediary. This can bypass front-end security controls or poison request handling. The fix makes the parser handling of the WebSocket upgrade edge case consistent so the smuggling vector is closed.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you are using the server-side component.
Background info
aiohttp is vulnerable to HTTP Request Smuggling in versions 0.0.1 - 3.14.1.
How to fix this
Upgrade the aiohttp library to the patch version.
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SOC 2Compliant
ISO 27001Compliant