@fastify/busboy vulnerable to Denial of Service via prototype-named multipart part header

Date Oct 2, 2026
Type Vendor advisory
Signal High-risk advisory
Vendor / Product npm ยท @fastify/busboy
CVE CVE-2026-19481
High-risk advisory CVE-2026-19481

Summary

@fastify/busboy vulnerable to Denial of Service via prototype-named multipart part header

Why it matters

GitHub has published a reviewed security advisory for @fastify/busboy. Prioritize it with other application dependency updates, especially because EPSS places it in the 40% percentile.

Operator check

Check whether @fastify/busboy is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. EPSS probability: 0.5%; percentile: 40%.

Sources

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.