---
id: CVE-2026-19474
title: '@fastify/multipart is a multipart form-data parser for Fastify'
summary: >-
  @fastify/multipart is a multipart form-data parser for Fastify. In versions
  from 3.0.0 up to but not including 10.1.1, request.saveRequestFiles() can
  leave completed temporary files on disk when a client disconnects while the
  parser is a…
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'
cwe:
  - CWE-459
  - CWE-770
published: '2026-08-15'
updated: '2026-08-15'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-19474'
references:
  - url: 'https://cna.openjsf.org/security-advisories.html'
    label: ce714d77-add3-4f53-aff5-83d477b104bb
  - url: >-
      https://github.com/fastify/fastify-multipart/security/advisories/GHSA-62qx-hpj5-j6hc
    label: ce714d77-add3-4f53-aff5-83d477b104bb
tags:
  - nvd
ingestedAt: '2026-08-16T13:39:02.975Z'
epss: 0.00278
epssPercentile: 0.20567
---

## Overview

@fastify/multipart is a multipart form-data parser for Fastify. In versions from 3.0.0 up to but not including 10.1.1, request.saveRequestFiles() can leave completed temporary files on disk when a client disconnects while the parser is advancing between multipart parts. The iterator rejection that occurs between parts falls outside the per-file cleanup path, so an earlier completed file is never removed. An unauthenticated client can repeat this to cause persistent, linear disk consumption, leading to denial of service. This is an incomplete-fix variant of CVE-2025-24033. The issue is fixed in @fastify/multipart 10.1.1. Users should upgrade to 10.1.1.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.