What is CVE-2026-19484?

CVE-2026-19484 is a high-severity vulnerability in @Fastify/busboy, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2026-08-13.

How severe is CVE-2026-19484?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in @Fastify/busboy

CVE-2026-19484

@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 vendore…

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

@Fastify/busboy — versions 3.1.0, 3.2.1

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)
CWE-1322

References

ce714d77-add3-4f53-aff5-83d477b104bb
ce714d77-add3-4f53-aff5-83d477b104bb

Frequently asked questions

What is CVE-2026-19484?: CVE-2026-19484 is a high-severity vulnerability in @Fastify/busboy, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2026-08-13.
How severe is CVE-2026-19484?: High severity. CVSS v3 base score is 7.5 out of 10.