@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.
References
| Link | Resource |
|---|---|
| https://cna.openjsf.org/security-advisories.html | Third Party Advisory |
| https://github.com/fastify/busboy/security/advisories/GHSA-xjh9-v7x6-24jw | Vendor Advisory |
Configurations
History
No history.
Information
Published : 2026-08-13 10:17
Updated : 2026-09-03 19:10
NVD link : CVE-2026-19484
Mitre link : CVE-2026-19484
CVE.ORG link : CVE-2026-19484
JSON object : View
Products Affected
fastify
- fastify\/busyboy