Detections
Analytics
CVE-2026-128126
high
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, Request.post() does not limit the number of fields in a URL-encoded form body, and inserting many repeated keys into MultiDict takes quadratic time on the event loop. A remote attacker can send a form POST within client_max_size to a handler that calls Request.post() and block the event loop. This issue is fixed in version 3.14.4.
References
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-xgw8-8ccx-rmqh
https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4
https://github.com/aio-libs/aiohttp/pull/13741
https://github.com/aio-libs/aiohttp/pull/13738
https://github.com/aio-libs/aiohttp/commit/8b0100572936df28977b9de8a6cc7e464c0b521e
https://github.com/aio-libs/aiohttp/commit/615fec3d4f088f30d2ee72cad760152e92aa1c53