Bug 2407250 (CVE-2025-58186)

Summary: CVE-2025-58186 golang.org/net/http: Lack of limit when parsing cookies can cause memory exhaustion in net/http
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: aazores, abarbaro, adistefa, akostadi, akoudelk, alcohan, alebedev, alinfoot, alizardo, amasferr, amctagga, anjoseph, anpicker, ansmith, anthomas, aoconnor, aruklets, asatyam, bdettelb, bniver, carogers, chfoley, ckandaga, cmah, crizzo, dakwon, dhanak, diagrawa, dkeler, dmayorov, doconnor, drosa, dschmidt, dsimansk, dtrifiro, dymurray, eaguilar, ebaron, eborisov, eglynn, ehelms, erezende, fdeutsch, flucifre, ggainey, gmeno, gparvin, groman, haoli, hasun, hkataria, ibolton, jajackso, jbalunas, jbritton, jburrell, jcammara, jcantril, jchui, jeder, jfula, jhe, jjoyce, jkoehler, jlanda, jlledo, jmatthew, jmitchel, jmontleo, jneedle, jolong, jowilson, jpasqual, jprabhak, jpretori, jschluet, juwatts, kbempah, kegrant, kingland, koliveir, kshier, ktsao, kverlaen, lball, lbragsta, lchilton, lgamliel, lhh, lphiri, mabashia, manissin, matzew, mbenjamin, mbocek, mburns, mgarciac, mhackett, mhulan, mnovotny, mrunge, mwringe, nboldt, ngough, nmoumoul, nyancey, oaljalju, ometelka, oramraz, osousa, owatkins, pahickey, pantinor, pbraun, pcreech, peholase, pgaikwad, pjindal, psrna, ptisnovs, pvasanth, rbryant, rchan, rekumar, rfreiman, rgodfrey, rhaigner, rhel-process-autobot, rjohnson, rojacob, sabiswas, sakbas, sausingh, sbratsla, sdawley, sfeifer, shvarugh, simaishi, slucidi, smallamp, smcdonal, smullick, solenoci, sostapov, sseago, stcannon, stirabos, suppawar, swoodman, syedriko, teagle, tfister, thason, thavo, tmalecek, tsedmik, tzivkovi, vereddy, veshanka, vimartin, vkarehfa, vvoronko, watson-tool-maintainers, weaton, wenshen, whayutin, wtam, xdharmai, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in golang.org/net/http. A remote attacker could exploit this vulnerability by sending a large number of small cookies to an HTTP server. Despite a default 1MB limit on HTTP headers, the number of cookies parsed is unrestricted, leading to excessive memory allocation. This can cause the server to consume significant memory resources, resulting in a denial of service (DoS) for legitimate users.
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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 2025-10-29 23:01:46 UTC 
Despite HTTP headers having a default limit of 1MB, the number of cookies that can be parsed does not have a limit. By sending a lot of very small cookies such as "a=;", an attacker can make an HTTP server allocate a large amount of structs, causing large memory consumption.