AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, when the pipelined request queue is full, the pure-Python parser stores the unparsed remainder internally and also returns the same data to its caller. After a handler declines an upgrade request, the caller feeds the remainder back to the parser, causing the buffer to grow with each handled request and dispatching already-handled requests to the application again.
The issue affects deployments using AIOHTTP_NO_EXTENSIONS or otherwise running without the standard C-extension wheel, and can cause excessive memory use and repeated request processing. 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
Low
Partial data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 6
https://github.com/aio-libs/aiohttp/commit/47babd8c23ca79e2bae6cc8dcb5752b61e36…
security-advisories@github.com
https://github.com/aio-libs/aiohttp/commit/72eaa429cf89b1e20212590f3e7044442395…
security-advisories@github.com
https://github.com/aio-libs/aiohttp/pull/13356
security-advisories@github.com
https://github.com/aio-libs/aiohttp/pull/13360
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-28qf-cpwq-vmc2
security-advisories@github.com