Bug 2491465 (CVE-2026-54278)

Summary:	CVE-2026-54278 aiohttp: aiohttp: Denial of Service due to excessive memory consumption from compressed request body
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	adudiak, alinfoot, anpicker, anthomas, aprice, bbrownin, bdettelb, bparees, brasmith, cochase, dfreiber, doconnor, dranck, drow, dschmidt, dtrifiro, ehelms, erezende, ggainey, gtanzill, hasun, ilpinto, jburrell, jbuscemi, jdobes, jfula, jkoehler, jlanda, jmitchel, jowilson, jsamir, juwatts, jwong, kaycoth, kshier, lbrazdil, lichen, ljawale, lphiri, ltomasbo, luizcosta, mbarnett, mhulan, mminar, nmoumoul, nweather, nyancey, oezr, omaciel, ometelka, orabin, osousa, pakotvan, pbohmill, pcreech, ptisnovs, rbiba, rbobbitt, rbryant, rchan, rjohnson, simaishi, smallamp, sskracic, stcannon, sthirugn, syedriko, teagle, tmalecek, tpfromme, ttakamiy, vkumar, weaton, xdharmai, xialiu, yguenane, ykashtan, zzhou
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. An attacker could send a specially crafted compressed request body that, during cleanup, would be decompressed into memory in one large chunk. This could potentially lead to a Denial of Service (DoS) condition, where the affected system becomes unresponsive or unavailable.	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 2026-06-22 18:02:59 UTC

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, during cleanup it is possible for a compressed request body to be decompressed into memory in one chunk. An attacker may be able to send a compressed payload in specific situations that could be decompressed into memory, potentially leading to DoS (a zip bomb edge case). This vulnerability is fixed in 3.14.1.