CVE-2026-54279: 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, host-only cookies that are saved with CookieJar.save() and then restored later with CookieJar.load() lose their host-only status. 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.