CVE-2026-2359
Denial of Service in Multer Middleware via Connection Drop
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-772 | The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed. |
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, specifically file uploads. In versions prior to 2.1.0, an attacker can exploit this vulnerability by dropping the connection during a file upload process.
This action can trigger a Denial of Service (DoS) condition, potentially causing resource exhaustion on the server handling the uploads.
To fix this issue, users should upgrade Multer to version 2.1.0 or later, as no known workarounds are available.
How can this vulnerability impact me? :
The primary impact of this vulnerability is a Denial of Service (DoS) condition on the server using Multer for file uploads.
An attacker can cause resource exhaustion by dropping connections during file uploads, which may degrade or completely disrupt the availability of the affected service.
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 that fixes the issue.
No known workarounds are available, so upgrading is the recommended immediate step.