CVE-2026-19484
CVE-2026-19484 · @fastify/busboy vulnerable to Denial of Service via oversized multipart boundary
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@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.
CVSS 7.5 · Hoch · EPSS 0,6% · Korrektur verfügbar
- Veröffentlicht
- Aktualisiert
Technologie-Stack: node
Betroffene Produkte und Versionen
@fastify/busboy
- Softwareversionen
- ≥ 3.1.0, < 3.2.1: Betroffen (semver)
- 3.2.1: Nicht betroffen (semver)
Auf 3.2.1 aktualisieren
@fastify/busboy npm
- Betroffene Versionsbereiche
- SEMVER: ≥ 3.1.0, < 3.2.1
Auf 3.2.1 aktualisieren