Detections
Analytics
CVE-2026-128124
high
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, Application.add_domain() converts every asterisk wildcard in a domain mask into a greedy regular-expression fragment, so a mask containing two or more wildcards can take polynomial time to reject a long Host header that does not match. A remote attacker can repeatedly send such headers to a server configured with a multi-wildcard domain mask and stall the event loop. This issue is fixed in version 3.14.4.
References
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-jm3w-gw2p-xjfj
https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4
https://github.com/aio-libs/aiohttp/pull/13945
https://github.com/aio-libs/aiohttp/pull/13943
https://github.com/aio-libs/aiohttp/commit/c6ac0e44c3c573ff9616f4a6a532992538b31e43
https://github.com/aio-libs/aiohttp/commit/766b882820da0651c84090e366a3b024b4a263c9