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CVE-2026-19484 - @fastify/busboy vulnerable to Denial of Service via oversized multipart boundary

CVE ID : CVE-2026-19484 Published : Aug. 13, 2026, 10:17 a. m. • 48 minutes ago Description : @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. Severity: 7.5 • HIGH