Bug 2519913 (CVE-2026-75593)

Summary:	CVE-2026-75593 github.com/moby/buildkit: BuildKit: File escape vulnerability allows unauthorized file modification
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:	abarbaro, akhatavk, akoudelk, alizardo, amctagga, anjoseph, anpicker, aoconnor, aos-team-art-private, aruklets, asatyam, asdas, bniver, bparees, cahl, cdrage, crizzo, derez, dfreiber, dhanak, diagrawa, dkeler, doconnor, dpaolell, drosa, drow, dschmidt, dsimansk, dymurray, eborisov, eglynn, flucifre, gmeno, gparvin, groman, gtanzill, hasun, ibolton, jburrell, jbuscemi, jcantril, jchui, jdelft, jfula, jhe, jjoyce, jlanda, jmatthew, jmontleo, jowilson, jprabhak, jpretori, jsamir, jschluet, jupierce, kaycoth, kbempah, kingland, kshier, ktsao, lball, lbragsta, lgamliel, lgarciaa, lhh, ljawale, mbenjamin, mbiarnes, mburns, mgarciac, mhackett, mnovotny, msilmser, nboldt, ngough, nyancey, oaljalju, ometelka, pakotvan, pgaikwad, ppalepu, ppostler, prdhamdh, psrna, ptisnovs, rekumar, rhaigner, rhel-process-autobot, rjohnson, rojacob, rushinde, sabiswas, sakbas, sausingh, sbratsla, sdawley, sghai, sidsharm, simaishi, slucidi, solenoci, sostapov, sseago, stcannon, sthirugn, suppawar, syedriko, teagle, thason, vereddy, veshanka, vkumar, vlaad, vvoronko, watson-tool-maintainers, wenshen, whayutin, wtam, 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 BuildKit, a toolkit for converting source code to build artifacts. A malicious client with valid permissions to access the BuildKit control API can craft a special upload request. This request allows files to escape from the BuildKit-controlled state directory, potentially leading to unauthorized modification or deletion of files on the system.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-08-19 20:21:30 UTC

BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. Prior to 0.31.2, 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 BuildKit control API to issue builds, eg., bypass authentication, etc. This issue is fixed in version 0.31.2.