CVE Watch3 sept 2026

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 ev

CVSS

7.5

Alto

EPSS

0.6%

p50

KEV

—

Exploit Today

0-100

Publicado: 13 ago 2026 · Última mod.: 3 sept 2026 · CWE-835 · CWE-1322

EPSS · 30d

0.6%EPSS · 30 días0.6%

2026-10-162026-11-12

Descripción técnica

@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.

Referencias oficiales

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