{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "3.1.0"
              },
              {
                "fixed": "3.2.1"
              },
              {
                "fixed": "3.2.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION"
            ]
          },
          "events": [
            {
              "introduced": "be7065f4e663a89a7c0006841fd1fb59dabfe4ca"
            },
            {
              "fixed": "b404d602fe173809e5e71bf0b46132c656844047"
            }
          ],
          "repo": "https://github.com/fastify/busboy",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-xjh9-v7x6-24jw"
  ],
  "database_specific": {
    "cna_assigner": "openjs",
    "cwe_ids": [
      "CWE-1322",
      "CWE-835"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/19xxx/CVE-2026-19484.json"
  },
  "details": "@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.",
  "id": "CVE-2026-19484",
  "modified": "2026-08-15T11:31:07.385105224Z",
  "published": "2026-08-13T08:50:47.361Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://cna.openjsf.org/security-advisories.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/19xxx/CVE-2026-19484.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/fastify/busboy/security/advisories/GHSA-xjh9-v7x6-24jw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19484"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "@fastify/busboy vulnerable to Denial of Service via oversized multipart boundary"
}