Nest: Middleware Bypass on Fastify via Trailing Slash_CVE-2026-54281

{
    "lastseen": "",
    "description": "Nest is a framework for building scalable Node.js server-side applications. Prior to 11.1.24, an authentication bypass vulnerability exists in @nestjs/platform-fastify. 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. This vulnerability is fixed in 11.1.24.",
    "published": "2026-06-22T20:48:45.895Z",
    "modified": "2026-06-22T20:48:45.895Z",
    "type": "cve",
    "title": "Nest: Middleware Bypass on Fastify via Trailing Slash",
    "source": "GitHub_M",
    "references": "https://github.com/nestjs/nest/security/advisories/GHSA-6v32-fjc9-9qf6",
    "id": "CVE-2026-54281",
    "bulletinFamily": "",
    "cwe": [
        "CWE-863"
    ],
    "cvelist": null,
    "sourceData": "nestjs nest < 11.1.24",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "vector": "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "nest",
    "version": "< 11.1.24",
    "vendor": "nestjs",
    "ai_description": "Authentication bypass vulnerability in @nestjs/platform-fastify due to middleware bypass via trailing slash",
    "ai_severity": "High",
    "ai_vendor": "NestJS",
    "ai_product": "Nest",
    "ai_version": "< 11.1.24",
    "ai_score": 8.7
}