Bug 2491464 (CVE-2026-54273)

Summary: CVE-2026-54273 aiohttp: AIOHTTP: Denial of Service via excessive pipelined requests
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: 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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A flaw was found in AIOHTTP, an asynchronous HTTP client/server framework for asyncio and Python. An attacker could exploit this vulnerability by sending an unlimited number of pipelined requests, causing the system to consume excessive amounts of memory. This could lead to a Denial of Service (DoS), making the affected system unavailable to legitimate users.
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Description OSIDB Bzimport 2026-06-22 18:02:56 UTC 
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, no limit was present on the number of pipelined requests that could be queued. An attacker may be able to use pipelined requests to use excessive amounts of memory, potentially leading to DoS. This vulnerability is fixed in 3.14.1.