CVE-2026-88932: Multer

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Multer Multer: from 2.2.0, before 2.4.0 (fixed in 2.4.0)

Published 2026-09-14. Last modified 2026-09-16.