Bug 2573465 (CVE-2026-128124) - CVE-2026-128124 aiohttp: aiohttp: Denial of Service via inefficient domain mask wildcard matching
Summary: CVE-2026-128124 aiohttp: aiohttp: Denial of Service via inefficient domain ma...
Keywords:
Status: NEW
Alias: CVE-2026-128124
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-13 20:31 UTC by OSIDB Bzimport
Modified: 2026-11-13 20:39 UTC (History)
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Description OSIDB Bzimport 2026-11-13 20:31:35 UTC 
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.
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