CVE-2026-128129

UNKNOWN 0.0

AIOHTTP: Unbounded buffering of data received during an upgrade request

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, 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.

CWE	CWE-770
Vendor	aio-libs
Product	aiohttp
Published	Nov 13, 2026
Last Updated	Nov 13, 2026

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Affected Versions

aio-libs / aiohttp

< 3.14.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/aio-libs/aiohttp/security/advisories/GHSA-pw86-h8fm-j323 github.com: https://github.com/aio-libs/aiohttp/pull/13501 github.com: https://github.com/aio-libs/aiohttp/pull/13511 github.com: https://github.com/aio-libs/aiohttp/commit/3d850ee9b92573c7e913821cbcb96005beb3f4df github.com: https://github.com/aio-libs/aiohttp/commit/c207cadb257e0959b192ffca0548eca8c71eb96a github.com: https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4