---
id: CVE-2026-77037
aliases:
  - GHSA-qfvm-cv95-jqjf
title: >-
  multer vulnerable to Denial of Service via file descriptor leak on aborted
  uploads
summary: >-
  multer vulnerable to Denial of Service via file descriptor leak on aborted
  uploads
severity: high
cvss: 7.5
cwe:
  - CWE-400
  - CWE-459
vendor: multer
product: multer
ecosystem: npm
affected:
  - multer = 2.2.0
patched:
  - multer 2.3.0
published: '2026-09-08'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T21:29:51Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-qfvm-cv95-jqjf'
references:
  - url: >-
      https://github.com/expressjs/multer/security/advisories/GHSA-qfvm-cv95-jqjf
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77037'
  - url: >-
      https://github.com/expressjs/multer/commit/eef74440b491ef0f976f3d25895e8089ae495df0
  - url: 'https://cna.openjsf.org/security-advisories.html'
  - url: 'https://github.com/expressjs/multer/releases/tag/v2.3.0'
  - url: 'https://github.com/advisories/GHSA-qfvm-cv95-jqjf'
tags:
  - ghsa
  - npm
epss: 0.00347
epssPercentile: 0.28369
ingestedAt: '2026-09-08T22:12:30.967Z'
---

## Overview

### Impact

A vulnerability in multer `2.2.0` allows an attacker to trigger a Denial of Service (DoS) by aborting or truncating multipart uploads. When using `diskStorage`, the destination write stream is not closed if the upload is aborted before it finishes, so each failed request leaks an open file descriptor and retains its disk blocks until the process exits. Repeated failed uploads can exhaust the available file descriptors. All applications using multer's disk storage are affected.

### Patches

Users should upgrade to `2.3.0`.

### Workarounds

None.

## Affected packages

- `multer = 2.2.0`

## Remediation

Upgrade to a patched release:

- `multer 2.3.0`