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

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Overview

CVE-2025-47944 is a serious vulnerability in Multer, a middleware for Node.js, used in handling `multipart/form-data`. It affects versions 1.4.4-lts.1 and earlier, causing potential system compromise or data leakage. This vulnerability is significant due to its potential impact on system availability, should an attacker exploit it to trigger a Denial of Service (DoS) attack.

Vulnerability Summary

CVE ID: CVE-2025-47944
Severity: High (7.5 CVSS Score)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Multer Middleware for Node.js | 1.4.4-lts.1 and prior

How the Exploit Works

The vulnerability exists due to the way Multer processes malformed multi-part upload requests. An attacker can send a specially crafted multi-part upload request that triggers an unhandled exception in Multer, leading to a crash of the process. This results in a DoS situation, disrupting the availability of the service.

Conceptual Example Code

An attacker could potentially exploit this vulnerability by sending a malformed multi-part upload request as shown in the conceptual example below:

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

In this hypothetical example, the `boundary` parameter within the `Content-Type` header is malformed, which could cause Multer to throw an unhandled exception and crash the process.

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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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