{"id":"CVE-2026-19484","revision":"c5b48c2f86b242b3b41693ff87d3859d","records":[{"revision":"c5b48c2f86b242b3b41693ff87d3859d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-19484","aliases":[],"title":"@fastify/busboy vulnerable to Denial of Service via oversized multipart boundary","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.","state":0,"publishedAt":"2026-08-13T08:50:47.361+00:00","modifiedAt":"2026-08-13T14:27:01.128+00:00","affected":[{"ecosystem":"Vendor product","name":"@fastify/busboy","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"@fastify/busboy\",\n                    \"product\": \"@fastify/busboy\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"versionType\": \"semver\",\n                            \"status\": \"affected\",\n                            \"version\": \"3.1.0\",\n                            \"lessThan\": \"3.2.1\"\n                        },\n                        {\n                            \"versionType\": \"semver\",\n                            \"status\": \"unaffected\",\n                            \"version\": \"3.2.1\"\n                        }\n                    ],\n                    \"packageURL\": \"pkg:npm/@fastify/busboy\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/fastify/busboy/security/advisories/GHSA-xjh9-v7x6-24jw","https://cna.openjsf.org/security-advisories.html"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-19484","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-19484","identifiers":["CVE-2026-19484"]},"retained":false,"historicalAffected":[]}],"coverage":[]}