CVE-2026-88932

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

State: Published
Severity: 5.3 Medium
Published: Sep 14, 2026
Updated: Sep 14, 2026
Reserved: Sep 10, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	openjs

Weaknesses

CWE-400 Uncontrolled Resource Consumption
CWE-459 Incomplete Cleanup

Affected Products

Product	Versions
multermulter	2.2.0 to before 2.4.0Affected 2.4.0Not affected

References

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