# CVE-2026-19484

## Summary

- **CVE ID:** CVE-2026-19484
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-835, CWE-1322
- **Published:** Aug 13, 2026
- **Last Modified:** Aug 13, 2026

## Description

@fastify/busboy is a multipart form-data parser. In versions 3.1.0 through 3.2.0, a remote unauthenticated attacker can stall the Node.js event loop by sending a multipart request whose boundary is crafted to a specific length. The vendored streaming search stores its skip table in a fixed 256 entry byte array, and a boundary of exactly 252 bytes makes the search needle 256 bytes, which truncates the default skip distance to zero and turns the search into a CPU bound loop on a small body. A single small request can keep one core busy and deny service to other requests handled by the same process. The issue is fixed in @fastify/busboy 3.2.1, which widens the skip table so the skip distance is preserved. Users should upgrade to 3.2.1.

## Affected Products

- @fastify/busboy — @fastify/busboy (3.1.0)
- @fastify/busboy — @fastify/busboy (3.2.1)

## References

- [CNA](https://github.com/fastify/busboy/security/advisories/GHSA-xjh9-v7x6-24jw)
- [CNA](https://cna.openjsf.org/security-advisories.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.35%
- **EPSS Percentile:** 27.9

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._