---
id: CVE-2026-77037
title: >-
  multer: Multer: Denial of Service via file descriptor leak on aborted uploads
  (CVE-2026-77037)
summary: >-
  A flaw was found in multer, a Node.js middleware for handling
  multipart/form-data. A remote attacker can exploit a file descriptor leak by
  sending repeated aborted or malformed multipart uploads. This can exhaust
  system resources, leading …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-772
  - CWE-400
  - CWE-459
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - logging_subsystem_for_red_hat_openshift
  - developer_hub
  - enterprise_linux 10
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - trusted_profile_analyzer
  - ansible_automation_platform 2.2
  - developer_hub 1.10
patched:
  - ansible_automation_platform 2.2
  - developer_hub 1.10
published: '2026-08-28'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T08:50:08+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77037.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77037.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-77037'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2525787'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-77037'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77037'
  - url: 'https://cna.openjsf.org/security-advisories.html'
  - url: >-
      https://github.com/expressjs/multer/security/advisories/GHSA-qfvm-cv95-jqjf
  - url: 'https://access.redhat.com/errata/RHSA-2026:86675'
  - url: 'https://access.redhat.com/errata/RHSA-2026:82151'
  - url: 'https://access.redhat.com/errata/RHSA-2026:76788'
  - url: 'https://access.redhat.com/errata/RHSA-2026:79088'
  - url: >-
      https://github.com/expressjs/multer/commit/eef74440b491ef0f976f3d25895e8089ae495df0
  - url: 'https://github.com/expressjs/multer/releases/tag/v2.3.0'
  - url: 'https://github.com/advisories/GHSA-qfvm-cv95-jqjf'
tags:
  - csaf
  - vex
  - red-hat
  - ghsa
  - npm
epss: 0.00457
epssPercentile: 0.39468
aliases:
  - GHSA-qfvm-cv95-jqjf
ecosystem: npm
ingestedAt: '2026-09-08T22:12:30.967Z'
---

## Overview

A flaw was found in multer, a Node.js middleware for handling multipart/form-data. A remote attacker can exploit a file descriptor leak by sending repeated aborted or malformed multipart uploads. This can exhaust system resources, leading to a denial of service (DoS) for the affected application.

## Vendor advisories

- **RHSA-2026:86675** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.2 · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:86675)
- **RHSA-2026:82151** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.2 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82151)
- **RHSA-2026:76788** · Red Hat · fixed in: Red Hat Developer Hub 1.10 · released 2026-10-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:76788)
- **RHSA-2026:79088** · Red Hat · fixed in: Red Hat Developer Hub 1.10 · released 2026-10-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:79088)
- **Red Hat VEX** · Important · affected: Logging Subsystem for Red Hat OpenShift, Red Hat Developer Hub, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · no fix planned: Logging Subsystem for Red Hat OpenShift, Red Hat Developer Hub, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, … · updated 2026-10-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77037.json)

**multer: Multer: Denial of Service via file descriptor leak on aborted uploads** — rated Important by Red Hat. Released 2026-08-28, updated 2026-10-21.

Affected:

- Logging Subsystem for Red Hat OpenShift
- Red Hat Developer Hub
- 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

Fixed:

- Red Hat Ansible Automation Platform 2.2
- Red Hat Developer Hub 1.10

No fix planned:

- Logging Subsystem for Red Hat OpenShift
- Red Hat Developer Hub
- 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

Not affected:

- Red Hat Developer Hub 1.10
- Red Hat 3scale API Management Platform 2
- Red Hat Hardened Images

## Remediation

For more about Ansible plugins for Red Hat Developer Hub, see References links https://access.redhat.com/errata/RHSA-2026:86675
For more about Ansible Portal Installer Bootc, see References links https://access.redhat.com/errata/RHSA-2026:82151
For more about Red Hat Developer Hub, see References links https://access.redhat.com/errata/RHSA-2026:76788

Workarounds / mitigations:

- Upgrade to multer 2.3.0 or later, which properly closes the destination write stream on abnormal source termination and defers cleanup until the stream has closed.

## Package advisory (CVE-2026-77037)

Affected packages:

- `multer = 2.2.0`

Patched in:

- `multer 2.3.0`

Source: https://github.com/advisories/GHSA-qfvm-cv95-jqjf