CVE-2026-54273: 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, no limit was present on the number of pipelined requests that could be queued. An attacker may be able to use pipelined requests to use excessive amounts of memory, potentially leading to DoS. This vulnerability is fixed in 3.14.1.

Affected products

• Aiohttp Aiohttp: before 3.14.1 (fixed in 3.14.1)

Published 2026-06-22. Last modified 2026-06-26.