Denial of Service Vulnerability in Multer Middleware by ExpressJS
CVE-2025-48997

8.7HIGH

Key Information:

Vendor

Expressjs

Status
Multer
Vendor
CVE Published:
3 June 2025

What is CVE-2025-48997?

A vulnerability in Multer, a middleware for handling 'multipart/form-data' in node.js, permits attackers to exploit the service by sending a file upload request with an empty string field name. This action triggers an unhandled exception that can crash the application, leading to a Denial of Service. Users are advised to upgrade to version 2.0.1 or later as no known workarounds are available.

Affected Version(s)

multer >= 1.4.4-lts.1, < 2.0.1

References

https://github.com/expressjs/multer/security/advisories/G...
x_refsource_CONFIRM
https://github.com/expressjs/multer/issues/1233
x_refsource_MISC
https://github.com/expressjs/multer/pull/1256
x_refsource_MISC

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.