In short
- CVE-2026-111064 is a HIGH (CVSS 8.2) vulnerability affecting aiohttp.
- Chance of exploitation in the next 30 days (EPSS): 0.40%, higher than 34.2% of all vulnerabilities.
- Fix: update to 3.14.4 or later.
| Package | Affected versions | Patched versions |
|---|
| aiohttp PyPI | < 3.14.4
| 3.14.4
|
Description
Summary
The keepalive timeout was not used during the initial portion of a request.
Impact
An attacker could keep an idle connection open indefinitely before sending any data.
Workaround
Use a reverse proxy (as recommended for all production deployments) with sensible keepalive limits.
NVD description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, keepalive timeout handling is absent during the initial portion of a request. An attacker can keep an idle connection open indefinitely before sending any request data, consuming server connection capacity. This issue is fixed in version 3.14.4.
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