CVE-2026-123817
AIOHTTP WebSocket frame reassembly permits excessive memory consumption from tiny reads
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, the WebSocket reader retains one bytes object for each transport read while reassembling an incomplete frame. A malicious peer can split a frame into many tiny reads so per-object overhead substantially exceeds the payload bytes allowed by max_msg_size. The condition affects a server receiving frames from a malicious client and a client receiving frames from a malicious server, and can cause excessive memory consumption or denial of service. This issue is fixed in version 3.14.4.
INFO
Published Date :
Nov. 9, 2026, 9:17 p.m.
Last Modified :
Nov. 9, 2026, 9:17 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Solution
- Update AIOHTTP to version 3.14.4 or later.
- Ensure server and client are updated.
- Monitor memory usage after update.
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