@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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - @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. (CVE-2026-19484)

ID	Name	Product	Family	Type	Severity
472845	Chainguard: langfuse-3-worker: security update to 3.225.11-r5	Tenable Cloud Security	Chainguard Local Security Checks	Local	high
472845	Chainguard: langfuse-3-worker: security update to 3.225.11-r5	Tenable Self-Hosted Container Security	Chainguard Local Security Checks	Local	high
472270	SCA: security update for @fastify/busboy (GHSA-xjh9-v7x6-24jw)	Tenable Cloud Security	SCA Checks	Local	high
472270	SCA: security update for @fastify/busboy (GHSA-xjh9-v7x6-24jw)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-19484

high

Tenable Plugins

high

high

high

high