CVE-2026-54274: 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, if an attacker sends large incomplete websocket frame payloads, it may be possible to bypass the usual size limits on memory use. 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.