high7.5
CVE-2026-50269
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python.
Impact
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.0, attacker-controlled input included into multipart/payload headers can be used to modify a request to inject additional headers or similar. In the unlikely situation that an application is passing user-controlled strings into MultipartWriter.append(headers=...) or Payload.headers, then an attacker may be able to modify the request to inject headers or change the contents of the request. This vulnerability is fixed in 3.14.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | aiohttp | <= 3.13.5 | 3.14.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Aiohttp | Aiohttp | before 3.14.0 |