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CVE-2026-2359— Multer vulnerable to Denial of Service via resource exhaustion

Quick assessment

Affected
expressjs multer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Multer是expressjs开源的一个用于Node.js中间件。 Multer 2.1.0之前版本存在安全漏洞，该漏洞源于文件上传期间连接中断，可能导致资源耗尽和拒绝服务攻击。

AI Predicted 5.3 Difficulty: Easy EPSS 0.68% · P51

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
expressjs multer 0.0.0< 2.1.0 affected
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I. Basic Information for CVE-2026-2359

Vulnerability Information
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Vulnerability Title
Multer vulnerable to Denial of Service via resource exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对已超过有效生命周期的资源丧失索引
Source: CVE Program / CVE List V5
Vulnerability Title
Multer 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Multer是expressjs开源的一个用于Node.js中间件。 Multer 2.1.0之前版本存在安全漏洞，该漏洞源于文件上传期间连接中断，可能导致资源耗尽和拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
expressjs multer 0.0.0 ~ 2.1.0 -

II. Public POCs for CVE-2026-2359

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III. Intelligence Information for CVE-2026-2359

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Vendor Advisories for CVE-2026-2359 (2)

IV. Related Vulnerabilities

Same product: multer
Same vendor: expressjs
Same weakness: CWE-772

V. Comments for CVE-2026-2359

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