CVE-2025-48997: Expressjs Multer

High severity, CVSS 8.7. EPSS: 0.4% chance of exploitation in the next 30 days.

Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability that is present starting in version 1.4.4-lts.1 and prior to version 2.0.1 allows an attacker to trigger a Denial of Service (DoS) by sending an upload file request with an empty string field name. This request causes an unhandled exception, leading to a crash of the process. Users should upgrade to `2.0.1` to receive a patch. No known workarounds are available.

Affected products

• Expressjs Multer: from 1.4.4-lts.1, before 2.0.1 (fixed in 2.0.1)

Published 2025-06-03. Last modified 2026-06-17.