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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 6
https://github.com/aio-libs/aiohttp/commit/3d850ee9b92573c7e913821cbcb96005beb3…
security-advisories@github.com
https://github.com/aio-libs/aiohttp/commit/c207cadb257e0959b192ffca0548eca8c71e…
security-advisories@github.com
https://github.com/aio-libs/aiohttp/pull/13501
security-advisories@github.com
https://github.com/aio-libs/aiohttp/pull/13511
security-advisories@github.com
https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4
security-advisories@github.com
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-pw86-h8fm-j323
security-advisories@github.com