CVE-2026-3304
Denial of Service in Multer Middleware via Malformed Requests
Publication date: 2026-02-27
Last updated on: 2026-03-19
Assigner: openjs
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| expressjs | multer | to 2.1.0 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-459 | The product does not properly "clean up" and remove temporary or supporting resources after they have been used. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in Multer, a Node.js middleware used for handling multipart/form-data. In versions prior to 2.1.0, an attacker can send malformed requests that trigger a Denial of Service (DoS) condition by causing resource exhaustion.
To fix this issue, users should upgrade Multer to version 2.1.0 or later. There are no known workarounds available.
How can this vulnerability impact me? :
The vulnerability can lead to a Denial of Service (DoS) attack, where an attacker sends malformed requests that exhaust system resources. This can cause the affected application or service using Multer to become unresponsive or crash, disrupting normal operations.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, users should upgrade Multer to version 2.1.0 or later, as this version contains the patch for the Denial of Service issue caused by malformed requests.
No known workarounds are available, so upgrading is the primary and immediate step to protect your system.