Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes_CVE-2026-45109

{
    "lastseen": "",
    "description": "Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.18 and 16.2.6, it was found that the fix addressing CVE-2026-44575 did not apply to middleware.ts with Turbopack. This vulnerability is fixed in 15.5.18 and 16.2.6.",
    "published": "2026-05-13T17:11:07.275Z",
    "modified": "2026-05-13T17:11:07.275Z",
    "type": "cve",
    "title": "Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes",
    "source": "GitHub_M",
    "references": "https://github.com/vercel/next.js/security/advisories/GHSA-26hh-7cqf-hhc6",
    "id": "CVE-2026-45109",
    "bulletinFamily": "",
    "cwe": [
        "CWE-288"
    ],
    "cvelist": null,
    "sourceData": "vercel next.js >= 15.2.0, < 15.5.17\nvercel next.js >= 16.0.0, < 16.2.6",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "next.js",
    "version": ">= 15.2.0, < 15.5.17",
    "vendor": "vercel",
    "ai_description": "",
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    "ai_score": 0
}