CVE-2026-123817
AIOHTTP WebSocket frame reassembly permits excessive memory consumption from tiny reads
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-770 |
| Vendor | aio-libs |
| Product | aiohttp |
| Published | Nov 9, 2026 |
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Affected Versions
aio-libs / aiohttp
< 3.14.4
References
github.com: https://github.com/aio-libs/aiohttp/security/advisories/GHSA-2g87-pp6c-29x5 github.com: https://github.com/aio-libs/aiohttp/pull/13352 github.com: https://github.com/aio-libs/aiohttp/pull/13612 github.com: https://github.com/aio-libs/aiohttp/commit/09bcaa73ff084a0c539bbf16a0a78743acb7141f github.com: https://github.com/aio-libs/aiohttp/commit/6a4f6682817839313b04b8e5cea2b39c1a88ab4f github.com: https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4