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blog: Feb 2026 Security Releases #2198

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---
title: February 2026 Security Releases
description: Security release for multer has been published. We recommend that all users upgrade as soon as possible.
tags: security vulnerabilities
authors:
- name: Ulises Gascón
github: UlisesGascon
---

The Express team has released a new patch version of [multer](https://www.npmjs.com/package/multer) addressing two high-severity security vulnerabilities.


{% include admonitions/warning.html
content="We recommend upgrading to the latest version of multer to secure your applications."
%}

The following vulnerabilities have been addressed:

- [CVE-2026-3304 in multer middleware (High)](#cve-2026-3304-in-multer-middleware-high)
- [CVE-2026-2359 in multer middleware (High)](#cve-2026-2359-in-multer-middleware-high)

## CVE-2026-3304 in multer middleware (High)

**[multer](https://www.npmjs.com/package/multer) versions `<2.1.0` are vulnerable to denial of service via incomplete cleanup**

A vulnerability in Multer versions <2.1.0 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing resource exhaustion.

**Affected versions**: `< 2.1.0`
**Patched version**: `>= 2.1.0`

For more details, see [GHSA-xf7r-hgr6-v32p](https://github.com/expressjs/multer/security/advisories/GHSA-xf7r-hgr6-v32p).

## CVE-2026-2359 in multer middleware (High)

**[multer](https://www.npmjs.com/package/multer) versions `<2.1.0` are vulnerable to denial of service via resource exhaustion**

A vulnerability in Multer versions <2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion.

**Affected versions**: `< 2.1.0`
**Patched version**: `>= 2.1.0`

For more details, see [GHSA-v52c-386h-88mc](https://github.com/expressjs/multer/security/advisories/GHSA-v52c-386h-88mc).

---

We recommend upgrading to the latest version of multer to secure your applications.