CVE-2025-47944: Multer vulnerable to Denial of Service from maliciously crafted requests
Description
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 2.0.0 allows an attacker to trigger a Denial of Service (DoS) by sending a malformed multi-part upload request. This request causes an unhandled exception, leading to a crash of the process. Users should upgrade to version 2.0.0 to receive a patch. No known workarounds are available.
Classification
CVE ID: CVE-2025-47944
CVSS Base Severity: HIGH
CVSS Base Score: 7.5
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Problem Types
CWE-248: Uncaught ExceptionAffected Products
Vendor: expressjs
Product: multer
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.05% (probability of being exploited)
EPSS Percentile: 15.3% (scored less or equal to compared to others)
EPSS Date: 2025-06-15 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-47944https://github.com/expressjs/multer/security/advisories/GHSA-4pg4-qvpc-4q3h
https://github.com/expressjs/multer/issues/1176
https://github.com/expressjs/multer/commit/2c8505f207d923dd8de13a9f93a4563e59933665