Vulnerability · Published Aug 15, 2026 · Assigned by openjs
CVE-2026-19474@fastify/multipart vulnerable to Denial of Service via temporary file leak on aborted upload
High 7.5
In plain English
A high-severity resource allocation without limits in @fastify/multipart from @fastify/multipart. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| @fastify/multipart | @fastify/multipart | 3.0.0 – before 10.1.1 |
Weakness: CWE-459, CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H