GHSA-6V32-FJC9-9QF6

Vulnerability from github – Published: 2026-06-15 20:36 – Updated: 2026-07-18 17:26
VLAI
Summary
Nest: Middleware Bypass on Fastify via Trailing Slash
Details

Impact

An authentication bypass vulnerability exists in @nestjs/platform-fastify (confirmed on version 11.1.24, the latest available release at time of report). When middleware is registered through NestJS's MiddlewareConsumer.forRoutes() API on the Fastify adapter, an unauthenticated client can bypass the Nest middleware registered for that route by simply appending a trailing slash (/) to the request URL.

This bypass works on the default Fastify adapter configuration — no special router options need to be enabled. Applications using the standard CRUD route shape (GET /resource and GET /resource/:id) are affected when they protect those routes with MiddlewareConsumer.forRoutes() middleware.

Patches

Fixed in @nestjs/platform-fastify@11.1.24

References

Kudos goes to @a-tt-om

Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 11.1.23"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@nestjs/platform-fastify"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "11.1.24"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54281"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-15T20:36:43Z",
    "nvd_published_at": "2026-06-22T22:16:49Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nAn authentication bypass vulnerability exists in `@nestjs/platform-fastify` (confirmed on version `11.1.24`, the latest available release at time of report). When middleware is registered through NestJS\u0027s `MiddlewareConsumer.forRoutes()` API on the Fastify adapter, an unauthenticated client can bypass the Nest middleware registered for that route by simply appending a trailing slash (`/`) to the request URL.\n\nThis bypass works on the **default Fastify adapter configuration** \u2014 no special router options need to be enabled. Applications using the standard CRUD route shape (`GET /resource` and `GET /resource/:id`) are affected when they protect those routes with `MiddlewareConsumer.forRoutes()` middleware.\n\n### Patches\n\nFixed in `@nestjs/platform-fastify@11.1.24`\n\n### References\n\nKudos goes to @a-tt-om",
  "id": "GHSA-6v32-fjc9-9qf6",
  "modified": "2026-07-18T17:26:42Z",
  "published": "2026-06-15T20:36:43Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nestjs/nest/security/advisories/GHSA-6v32-fjc9-9qf6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54281"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nestjs/nest"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Nest: Middleware Bypass on Fastify via Trailing Slash"
}



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