Bug 2573478 (CVE-2026-128129) - CVE-2026-128129 aiohttp: aiohttp: Denial of Service via unbounded buffering during connection upgrades
Summary: CVE-2026-128129 aiohttp: aiohttp: Denial of Service via unbounded buffering d...
Keywords:
Status: NEW
Alias: CVE-2026-128129
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
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Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-13 20:41 UTC by OSIDB Bzimport
Modified: 2026-11-13 20:52 UTC (History)
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Description OSIDB Bzimport 2026-11-13 20:41:53 UTC 
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.
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