Bug 2573473 (CVE-2026-128126) - CVE-2026-128126 aiohttp: aiohttp: Denial of Service via excessive URL-encoded form fields
Summary: CVE-2026-128126 aiohttp: aiohttp: Denial of Service via excessive URL-encoded...
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Status: NEW
Alias: CVE-2026-128126
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
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Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-13 20:41 UTC by OSIDB Bzimport
Modified: 2026-11-13 20:49 UTC (History)
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Description OSIDB Bzimport 2026-11-13 20:41:34 UTC 
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, Request.post() does not limit the number of fields in a URL-encoded form body, and inserting many repeated keys into MultiDict takes quadratic time on the event loop. A remote attacker can send a form POST within client_max_size to a handler that calls Request.post() and block the event loop. This issue is fixed in version 3.14.4.
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