Multer <2.1.0 DoS via connection drop (Node.js)
CVE-2026-2359 Published on February 27, 2026

Multer vulnerable to Denial of Service via resource exhaustion
Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.0 allows an attacker to trigger a Denial of Service (DoS) by dropping connection during file upload, potentially causing resource exhaustion. Users should upgrade to version 2.1.0 to receive a patch. No known workarounds are available.

Github Repository NVD

Vulnerability Analysis

CVE-2026-2359 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Weakness Type

Missing Release of Resource after Effective Lifetime

The software does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed. When a resource is not released after use, it can allow attackers to cause a denial of service by causing the allocation of resources without triggering their release. Frequently-affected resources include memory, CPU, disk space, power or battery, etc.


Products Associated with CVE-2026-2359

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Red Hat Rhdh
 
Red Hat Ansible Portal
 
Red Hat Logging
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Trusted Profile Analyzer
 

Affected Versions

expressjs multer: Red Hat Developer Hub 1.8: Red Hat Developer Hub 1.9: Red Hat Self-service automation portal 2: Logging Subsystem for Red Hat OpenShift: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 7: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat Trusted Profile Analyzer:

Vulnerable Packages

The following package name and versions may be associated with CVE-2026-2359

Package Manager Vulnerable Package Versions Fixed In
npm multer < 2.1.0 2.1.0

Exploit Probability

EPSS
0.56%
Percentile
41.87%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.