Next.js: Middleware / Proxy redirects can be cache-poisoned_CVE-2026-44572

{
    "lastseen": "",
    "description": "Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, an external client could send a x-nextjs-data header on a normal request to a path handled by middleware that returns a redirect. When that happened, the middleware/proxy could treat the request as a data request and replace the standard Location redirect header with the internal x-nextjs-redirect header. Browsers do not follow x-nextjs-redirect, so the response became an unusable redirect for normal clients. If the application was deployed behind a CDN or reverse proxy that caches 3xx responses without varying on this header, a single attacker request could poison the cached redirect response for the affected path. Subsequent visitors could then receive a cached redirect response without a Location header, causing a denial of service for that redirect path until the cache entry expired or was purged. This vulnerability is fixed in 15.5.16 and 16.2.5.",
    "published": "2026-05-13T15:57:15.750Z",
    "modified": "2026-05-13T15:57:15.750Z",
    "type": "cve",
    "title": "Next.js: Middleware / Proxy redirects can be cache-poisoned",
    "source": "GitHub_M",
    "references": "https://github.com/vercel/next.js/security/advisories/GHSA-3g8h-86w9-wvmq",
    "id": "CVE-2026-44572",
    "bulletinFamily": "",
    "cwe": [
        "CWE-349"
    ],
    "cvelist": null,
    "sourceData": "vercel next.js >= 12.2.0, < 15.5.16\nvercel next.js >= 16.0.0, < 16.2.5",
    "sourceHref": "",
    "cvss": {
        "score": 3.7,
        "severity": "LOW",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
        "version": "3.1"
    },
    "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": "next.js",
    "version": ">= 12.2.0, < 15.5.16",
    "vendor": "vercel",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}