Bug 2503742 (CVE-2026-15789)

Summary: CVE-2026-15789 buildkit: github.com/moby/buildkit: BuildKit: File escape vulnerability
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: abarbaro, akhatavk, akoudelk, alizardo, amctagga, anjoseph, anpicker, aoconnor, aos-team-art-private, aruklets, asatyam, asdas, bniver, bparees, cahl, cdrage, crizzo, dfreiber, dhanak, diagrawa, dkeler, doconnor, dpaolell, drosa, drow, dschmidt, dsimansk, dymurray, eborisov, eglynn, flucifre, gbenhaim, gmeno, gparvin, groman, gtanzill, hasun, hoberger, ibolton, jbalunas, jburrell, jbuscemi, jcantril, jchui, jdelft, jfula, jhe, jjoyce, jlanda, jmatthew, jmontleo, jowilson, jprabhak, jpretori, jsamir, jschluet, jupierce, kbempah, kingland, kshier, ktsao, lball, lbragsta, lgamliel, lgarciaa, lhh, ljawale, lpele, mbenjamin, mbiarnes, mburns, mgarciac, mhackett, mnovotny, msilmser, nboldt, ngough, niyer, nyancey, oaljalju, ometelka, pakotvan, pgaikwad, ppalepu, ppostler, prdhamdh, psrna, ptisnovs, rekumar, rhaigner, rhel-process-autobot, rjohnson, rojacob, rushinde, sabiswas, sakbas, sarad, sausingh, sbratsla, sdawley, sghai, sidsharm, simaishi, slucidi, solenoci, sostapov, sprizend, sseago, stcannon, sthirugn, suppawar, syedriko, teagle, thason, tsze, twaugh, vereddy, veshanka, vkumar, vlaad, vvoronko, watson-tool-maintainers, wenshen, 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 BuildKit. A custom client with valid permissions to access the BuildKit control API can produce an upload request that allows files to escape from the BuildKit-controlled state directory. This could lead to unauthorized modification or disclosure of sensitive data.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2533585, 2533586, 2533587, 2533588, 2533590, 2533591, 2533592, 2533594, 2533589, 2533593    
Bug Blocks:    

Description OSIDB Bzimport 2026-07-21 17:01:59 UTC
A custom client can produce such an upload request to the BuildKit daemon that files can escape from the BuildKit-controlled state directory. The client needs to have valid permissions to access the BuildKit control API to issue builds, e.g., bypass authentication, etc.