Bug 2427257 (CVE-2025-69229)

Summary:	CVE-2025-69229 aiohttp: AIOHTTP: Denial of Service via excessive CPU usage in chunked message handling
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	adudiak, alinfoot, anpicker, anthomas, bbrownin, bdettelb, bparees, carogers, caswilli, dfreiber, doconnor, drow, dtrifiro, dymurray, ehelms, erezende, ggainey, haoli, hasun, hkataria, ibolton, jajackso, jburrell, jcammara, jdobes, jfula, jkoehler, jmatthew, jmitchel, jmontleo, jneedle, jowilson, jsamir, juwatts, jwong, kaycoth, kegrant, koliveir, kshier, lphiri, mabashia, mhulan, nmoumoul, nyancey, omaciel, ometelka, orabin, osousa, pakotvan, pbraun, pcreech, pgaikwad, ptisnovs, rbryant, rchan, rjohnson, shvarugh, simaishi, slucidi, smallamp, smcdonal, sseago, stcannon, sthirugn, syedriko, teagle, tfister, thavo, tmalecek, ttakamiy, vkumar, weaton, xdharmai, yguenane
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in aiohttp, an asynchronous HTTP client/server framework for asyncio and Python. An attacker can exploit this vulnerability by sending a large number of chunks in a message. This can lead to excessive blocking CPU usage when the application processes the request, potentially causing a Denial of Service (DoS) as the server becomes unresponsive to other requests.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Description OSIDB Bzimport 2026-01-06 00:01:46 UTC

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. In versions 3.13.2 and below, handling of chunked messages can result in excessive blocking CPU usage when receiving a large number of chunks. If an application makes use of the request.read() method in an endpoint, it may be possible for an attacker to cause the server to spend a moderate amount of blocking CPU time (e.g. 1 second) while processing the request. This could potentially lead to DoS as the server would be unable to handle other requests during that time. This issue is fixed in version 3.13.3.