Bug 2532957 (CVE-2026-88932)

Summary: CVE-2026-88932 multer: multer: Denial of Service via orphaned disk writes on aborted uploads
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, akostadi, alizardo, amasferr, dmayorov, dschmidt, jchui, jhe, jlanda, jlledo, kshier, ktsao, nboldt, oaljalju, pantinor, psrna, simaishi, stcannon, teagle, tsedmik, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in multer, a Node.js middleware for handling multipart/form-data uploads. When a request using disk storage is aborted during an upload, file writes that complete after multer's cleanup process are not removed. This can leave orphaned files on disk. A remote unauthenticated attacker can repeatedly initiate and abort uploads to accumulate these orphaned files, which can exhaust disk space and lead to a denial of service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-14 09:01:20 UTC
multer is a Node.js middleware for handling multipart/form-data uploads. In versions 2.2.0 through 2.3.0, when a request using disk storage is aborted mid-upload, file writes that complete after multer has already run its abort cleanup are not removed, so each aborted upload can leave an orphaned file on disk. A remote unauthenticated attacker can repeatedly start and abort uploads to accumulate orphaned files and exhaust disk space, causing a denial of service. The issue is fixed in multer 2.4.0, and users should upgrade to 2.4.0 or later.