multer vulnerable to Denial of Service via orphaned disk writes on aborted uploads

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-88932
StatePUBLISHED
Assigneropenjs
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-14 09:17:01 UTC
Updated2026-09-16 19:40:00 UTC
Descriptionmulter 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from ce714d77-add3-4f53-aff5-83d477b104bb

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS: 0.003140000 probability, percentile 0.243180000 (date 2026-09-16)

Problem Types: CWE-400 | CWE-459 | CWE-400 CWE-400: Uncontrolled Resource Consumption | CWE-459 CWE-459: Incomplete Cleanup

VersionSourceTypeScoreSeverityVector
3.1ce714d77-add3-4f53-aff5-83d477b104bbSecondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1CNACVSS5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Multer Multer affected 2.2.0 2.4.0 semver Not specified
CNA Multer Multer unaffected 2.4.0 semver Not specified

References

ReferenceSourceLinkTags
github.com/expressjs/multer/security/advisories/GHSA-3pph-fpjx-jg34 ce714d77-add3-4f53-aff5-83d477b104bb github.com
cna.openjsf.org/security-advisories.html ce714d77-add3-4f53-aff5-83d477b104bb cna.openjsf.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: euriconicacio (en)

CNA: UlisesGascon (en)

CNA: bjohansebas (en)

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