{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "9.2.0"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "f9b3e79c2c045c9af8e5860d96629943ceeb61b0"
            }
          ],
          "repo": "https://github.com/fastify/middie",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-8p85-9qpw-fwgw"
  ],
  "details": "A vulnerability in @fastify/middie versions \u003c 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware (for example, app.use('/secret', auth)).\n\nWhen Fastify router normalization options are enabled (such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related trailing-slash behavior), crafted request paths may bypass middleware checks while still being routed to protected handlers.",
  "id": "CVE-2026-2880",
  "modified": "2026-04-01T23:10:31.576862663Z",
  "published": "2026-02-27T19:16:12.807Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/fastify/middie/security/advisories/GHSA-8p85-9qpw-fwgw"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}