CVE-2026-19474 PUBLISHED

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

Assigner: openjs
Reserved: 10.08.2026 Published: 15.08.2026 Updated: 15.08.2026

@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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 7.5

Product Status

Vendor @fastify/multipart
Product @fastify/multipart
Versions Default: unaffected
  • affected from 3.0.0 to 10.1.1 (excl.)
  • Version 10.1.1 is unaffected

Credits

  • Hemanth-9087 reporter
  • mcollina remediation developer
  • UlisesGascon remediation reviewer
  • climba03003 analyst

References

Problem Types

  • CWE-459: Incomplete Cleanup CWE
  • CWE-770: Allocation of Resources Without Limits or Throttling CWE