CVE-2026-128124

UNKNOWN 0.0

AIOHTTP: Event loop stall in add_domain() wildcard matching

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-1333
Vendor	aio-libs
Product	aiohttp
Published	Nov 13, 2026

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Affected Versions

aio-libs / aiohttp

< 3.14.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/aio-libs/aiohttp/security/advisories/GHSA-jm3w-gw2p-xjfj github.com: https://github.com/aio-libs/aiohttp/pull/13943 github.com: https://github.com/aio-libs/aiohttp/pull/13945 github.com: https://github.com/aio-libs/aiohttp/commit/766b882820da0651c84090e366a3b024b4a263c9 github.com: https://github.com/aio-libs/aiohttp/commit/c6ac0e44c3c573ff9616f4a6a532992538b31e43 github.com: https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4