What is CVE-2026-19481?

CVE-2026-19481 is a high-severity vulnerability in @Fastify/busboy, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2026-08-13.

How severe is CVE-2026-19481?

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

Vulnerability in @Fastify/busboy

CVE-2026-19481

@fastify/busboy is a multipart form-data parser. In versions 1.0.0 through 3.2.0, an attacker who can submit multipart form-data can crash the parser by sending a part header whose name is a prototype-inherited property such as __proto__ o…

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 1.0.0, 3.2.1

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

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ce714d77-add3-4f53-aff5-83d477b104bb

Frequently asked questions

What is CVE-2026-19481?: CVE-2026-19481 is a high-severity vulnerability in @Fastify/busboy, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2026-08-13.
How severe is CVE-2026-19481?: High severity. CVSS v3 base score is 7.5 out of 10.