CVE-2026-128130

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, when the pipelined request queue is full, the pure-Python parser stores the unparsed remainder internally and also returns the same data to its caller. After a handler declines an upgrade request, the caller feeds the remainder back to the parser, causing the buffer to grow with each handled request and dispatching already-handled requests to the application again. The issue affects deployments using AIOHTTP_NO_EXTENSIONS or otherwise running without the standard C-extension wheel, and can cause excessive memory use and repeated request processing. This issue is fixed in version 3.14.4.

• CWE-770
• CWE-835

• https://github.com/aio-libs/aiohttp/commit/47babd8c23ca79e2bae6cc8dcb5752b61e369fc7
• https://github.com/aio-libs/aiohttp/commit/72eaa429cf89b1e20212590f3e704444239569fb
• https://github.com/aio-libs/aiohttp/pull/13356
• https://github.com/aio-libs/aiohttp/pull/13360
• https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4
• https://github.com/aio-libs/aiohttp/security/advisories/GHSA-28qf-cpwq-vmc2

Published

Nov 13, 2026

Last Modified

Nov 13, 2026

Status

Awaiting Analysis

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