Denial of Service Vulnerability in Multer Middleware for Node.js
CVE-2025-47944

7.5HIGH

Key Information:

Vendor

Expressjs

Status
Multer
Vendor
CVE Published:
19 May 2025

What is CVE-2025-47944?

Multer, a middleware for handling multipart/form-data in Node.js applications, is susceptible to a Denial of Service (DoS) vulnerability starting from version 1.4.4-lts.1 to prior to version 2.0.0. An attacker can exploit this vulnerability by sending a malformed multi-part upload request. This leads to an unhandled exception that results in crashing the process, potentially disrupting application operations. Users are advised to upgrade to version 2.0.0 or later to mitigate this issue, as there are no known workarounds available.

Affected Version(s)

multer >=1.4.4-lts.1, <2.0.0

References

https://github.com/expressjs/multer/security/advisories/G...
x_refsource_CONFIRM
https://github.com/expressjs/multer/issues/1176
x_refsource_MISC
https://github.com/expressjs/multer/commit/2c8505f207d923...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2025-47944 : Denial of Service Vulnerability in Multer Middleware for Node.js