Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-19474— @fastify/multipart vulnerable to Denial of Service via temporary file leak on aborted upload

Quick assessment

Affected
@fastify/multipart @fastify/multipart
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fastify @fastify/multipart是Fastify组织的一个处理multipart表单数据上传的插件。 Fastify @fastify/multipart 3.0.0版本至10.1.1之前版本存在资源管理错误漏洞，该漏洞源于request.saveRequestFiles()在处理multipart请求时，客户端断开连接导致已完成的临时文件未被移除，可能导致拒绝服务。

CVSS 7.5 · High EPSS 0.49% · P42

Affected Version Matrix 2

VendorProduct Version RangeStatus
@fastify/multipart @fastify/multipart 3.0.0< 10.1.1 affected
10.1.1 unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-19474

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
@fastify/multipart vulnerable to Denial of Service via temporary file leak on aborted upload
Source: CVE Program / CVE List V5
Vulnerability Description
@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.
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
清理环节不完整
Source: CVE Program / CVE List V5
Vulnerability Title
Fastify @fastify/multipart 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fastify @fastify/multipart是Fastify组织的一个处理multipart表单数据上传的插件。 Fastify @fastify/multipart 3.0.0版本至10.1.1之前版本存在资源管理错误漏洞，该漏洞源于request.saveRequestFiles()在处理multipart请求时，客户端断开连接导致已完成的临时文件未被移除，可能导致拒绝服务。
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
@fastify/multipart @fastify/multipart 3.0.0 ~ 10.1.1 -

II. Public POCs for CVE-2026-19474

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 13275 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-19474

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-19474 (1)

IV. Related Vulnerabilities

Same product: @fastify/multipart
Same vendor: @fastify/multipart
Same weakness: CWE-459