AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, aiohttp buffers all additional connection data received while a request marked for upgrade, such as a WebSocket handshake, is being handled, without a size limit or flow control. A remote attacker can stream data behind an upgrade request to a handler that does not immediately accept or reject the upgrade and cause unbounded memory consumption. This issue is fixed in version 3.14.4.
Advisories
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Fixes
Solution
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Workaround
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References
History
Fri, 13 Nov 2026 22:15:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Aio-libs
Aio-libs aiohttp |
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| Vendors & Products |
Aio-libs
Aio-libs aiohttp |
Fri, 13 Nov 2026 20:45:00 +0000
| Type | Values Removed | Values Added |
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| Description | AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, aiohttp buffers all additional connection data received while a request marked for upgrade, such as a WebSocket handshake, is being handled, without a size limit or flow control. A remote attacker can stream data behind an upgrade request to a handler that does not immediately accept or reject the upgrade and cause unbounded memory consumption. This issue is fixed in version 3.14.4. | |
| Title | AIOHTTP: Unbounded buffering of data received during an upgrade request | |
| Weaknesses | CWE-770 | |
| References |
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| Metrics |
cvssV4_0
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Projects
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-11-13T21:25:19.830Z
Reserved: 2026-11-12T22:42:47.032Z
Link: CVE-2026-128129
No data.
Status : Awaiting Analysis
Published: 2026-11-13T21:17:44.747
Modified: 2026-11-13T22:17:23.430
Link: CVE-2026-128129
No data.
OpenCVE Enrichment
Updated: 2026-11-14T16:45:19Z
Weaknesses