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CVE-2026-19474

@fastify/multipart vulnerable to Denial of Service via temporary file leak on aborted upload

HIGH
7.5
CVSS Score
Published: August 15, 2026 at 01:36 PM UTC
Updated: September 2, 2026 at 03:22 PM UTC
2 products affected across 2 vendorsFastify Multipart@fastify/multipart

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Severity
HIGH7.5
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fastify Multipart· Fastifynpm
95%
3.0.0 ≤ v < 10.1.1
Affected range stops below 10.1.1, so it looks safe — our inference, not a vendor statement
@fastify/multipart· Fastify Multipart
60%
3.0.0 ≤ v < 10.1.13.0.0
Vendor states this is fixed in 10.1.1 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

MitigationVendor Advisory
Source: cverecord
https://github.com/fastify/fastify-multipart/security/advisories/GHSA-62qx-hpj5-j6hc
Third Party Advisory
Source: cverecord
https://cna.openjsf.org/security-advisories.html

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHopenjs
Vector?

Quick Info

StatusANALYZED
CWE
CWE-459CWE-770

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