CVE-2026-54280: Aiohttp

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, payload resources are not closed correctly when a client disconnects in the middle of a write. If a payload is using an open file or similar limited resource, then an attacker may be able to cause resource starvation temporarily until garbage collection or similar closes the file. This vulnerability is fixed in 3.14.1.

Affected products

• Aiohttp Aiohttp: from 3.12.1, before 3.14.1 (fixed in 3.14.1)

Published 2026-06-22. Last modified 2026-09-16.