CVE-2026-19474
HIGHDescription
@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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 20% of all known CVEs.
References
Related Vulnerabilities
Other CWE-459 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2017-17090 | High | 7.5 | 82% | - | Fix |
| CVE-2021-39327 | Medium | 5.3 | 72% | - | - |
| CVE-2025-31650 | High | 7.5 | 60% | - | Fix |
| CVE-2022-1552 | High | 8.8 | 16% | - | Fix |
| CVE-2018-18924 | High | 8.8 | 9.5% | - | - |
| CVE-2023-41835 | High | 7.5 | 8.4% | - | Fix |
Common questions
How do I fix CVE-2026-19474?
Upgrade fastify-multipart to 10.1.1 or later.
Is CVE-2026-19474 being actively exploited?
Not that we know of. CVE-2026-19474 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.28% is the estimated probability that it will be exploited in the next 30 days. That is higher than 20% of all scored CVEs.
How severe is CVE-2026-19474?
CVE-2026-19474 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-19474 affect?
Published advisories record a fix for fastify-multipart (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-19474
Markdown
[](https://tridentstack.com/cve/CVE-2026-19474)HTML
<a href="https://tridentstack.com/cve/CVE-2026-19474"><img src="https://tridentstack.com/cve/badge/CVE-2026-19474.svg" alt="CVE-2026-19474"></a>Find and fix vulnerabilities across your fleet
TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.
This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-02.