CVE-2026-113872— multer vulnerable to Denial of Service via a pending asynchronous fileFilter after request teardown
Quick assessment
Affected
multer 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 是一个用于 Node.js 的中间件，负责处理 multipart/form-data 格式的文件上传。在 2.0.0 至 2.5.0（不含 2.5.0）的版本中，若将 multer 配置为使用异步的 ，单个请求可能导致 Node.js 进程崩溃。具体场景为：当某个文件的异步 仍在挂起时，若请求被中止，后续调用的待处理回调会尝试恢复一个已被 multer 销毁的解析流；此时底层解析器会在一个已无错误监听器的流上触发错误，Node.js 将其视为未处理的错误事件，从而导致进程退出。 任何使用异步 的 m
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-113872
Vulnerability Information
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Vulnerability Title
multer vulnerable to Denial of Service via a pending asynchronous fileFilter after request teardown
Source: CVE Program / CVE List V5
Vulnerability Description
multer is a middleware for Node.js that handles multipart/form-data file uploads. In versions from 2.0.0 before 2.5.0, when multer is configured with an asynchronous fileFilter, a single request can crash the Node.js process. If the request is aborted while one file's asynchronous fileFilter is still pending, the pending callback later resumes a parsing stream that multer has already torn down, and the underlying parser emits an error on a stream that no longer has an error listener, which Node raises as an unhandled error event so the process exits. Any application using multer with an asynchronous fileFilter is affected regardless of storage engine, while uploads using a synchronous fileFilter are not affected. The issue is fixed in multer 2.5.0, and users should upgrade to 2.5.0 or later. As a workaround, use a synchronous fileFilter.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-113872
| # | POC Description | Source Link | Shenlong Link |
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Vendor Advisories for CVE-2026-113872 (1)
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V. Comments for CVE-2026-113872
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