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CVE-2025-7338: DoS Vulnerability in Multer Node.js Middleware

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Overview

The vulnerability CVE-2025-7338 pertains to Multer, a widely used middleware for handling multipart/form-data in Node.js. This vulnerability, present in versions 1.4.4-lts.1 to 2.0.1, could potentially allow an attacker to trigger a Denial of Service (DoS) attack, crashing the system and possibly leading to system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2025-7338
Severity: High (7.5 CVSS)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service, potential system compromise, and data leakage

Affected Products

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Product | Affected Versions

Multer | 1.4.4-lts.1 to 2.0.1

How the Exploit Works

An attacker can exploit this vulnerability by sending a malformed multi-part upload request to the server running a vulnerable version of Multer. This malformed request triggers an unhandled exception in the Multer middleware, which in turn causes the Node.js process to crash, resulting in a Denial of Service.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited using an HTTP request with a malformed multi-part body.

POST /upload HTTP/1.1
Host: target.example.com
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW
------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="file"; filename="malformed_file"
Content-Type: application/octet-stream
{ "malicious_payload": "..." }
------WebKitFormBoundary7MA4YWxkTrZu0gW--

The ‘malicious_payload’ would be crafted in a way that it causes the unhandled exception when parsed by the Multer middleware.
Please note this is a simplified example and actual exploit may involve complex and obfuscated malicious data.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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