Vulnerabilities in pkg:npm/fastify

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-4mh8-r7rc-xpvc",
  "modified" : "2026-09-30T23:53:44Z",
  "published" : "2026-09-30T23:53:44Z",
  "aliases" : [ "CVE-2026-92081" ],
  "summary" : "fastify vulnerable to Denial of Service via unhandled exception on HTTP/2 trailer responses",
  "details" : "### Impact\n\n`fastify` crashes with an uncaught `ERR_HTTP2_INVALID_CONNECTION_HEADERS` exception when a route that registers a response trailer via `reply.trailer()` is served over HTTP/2. Fastify unconditionally adds the `Transfer-Encoding: chunked` header when a trailer is set, which is forbidden on HTTP/2, so Node.js throws while serializing the response headers. The exception is not caught and becomes an uncaughtException, terminating the Node.js process.\n\nOne unauthenticated HTTP/2 request to any route that uses trailers is enough to crash the server, dropping all in-flight requests, and the request can be repeated to keep the process down. Applications are affected only when HTTP/2 is enabled (`http2: true`) and at least one route registers a trailer. HTTP/1.x responses are not affected.\n\n### Patches\n\nUpgrade to `fastify` `5.12.5` or later.\n\n### Workarounds\n\nAvoid registering response trailers with `reply.trailer()` on routes served over HTTP/2 until upgrading.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "fastify"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.12.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/fastify/fastify/security/advisories/GHSA-4mh8-r7rc-xpvc"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-92081"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/fastify/fastify/issues/6574"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/fastify/fastify/commit/ad06a4c3fe8a944a904f38068249b18b8f552e90"
  }, {
    "type" : "WEB",
    "url" : "https://cna.openjsf.org/security-advisories.html"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/fastify/fastify"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/fastify/fastify/releases/tag/v5.12.5"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-248" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-30T23:53:44Z",
    "nvd_published_at" : "2026-09-16T09:17:10Z"
  }
}