Fastify Vulnerable to DoS via Unbounded Memory Allocation in sendWebStream_CVE-2026-25224

{
    "lastseen": "",
    "description": "Fastify is a fast and low overhead web framework, for Node.js. Prior to version 5.7.3, a denial-of-service vulnerability in Fastify\u2019s Web Streams response handling can allow a remote client to exhaust server memory. Applications that return a ReadableStream (or Response with a Web Stream body) via reply.send() are impacted. A slow or non-reading client can trigger unbounded buffering when backpressure is ignored, leading to process crashes or severe degradation. This issue has been patched in version 5.7.3.",
    "published": "2026-02-03T21:21:35.437Z",
    "modified": "2026-02-03T21:21:35.437Z",
    "type": "cve",
    "title": "Fastify Vulnerable to DoS via Unbounded Memory Allocation in sendWebStream",
    "source": "GitHub_M",
    "references": "https://github.com/fastify/fastify/security/advisories/GHSA-mrq3-vjjr-p77c\nhttps://github.com/fastify/fastify/commit/eb11156396f6a5fedaceed0140aed2b7f026be37\nhttps://hackerone.com/reports/3524779",
    "id": "CVE-2026-25224",
    "bulletinFamily": "",
    "cwe": [
        "CWE-770"
    ],
    "cvelist": null,
    "sourceData": "fastify fastify < 5.7.3",
    "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": [],
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        "baseScore": 0,
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        "confidentialityImpact": "",
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        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "fastify",
    "version": "< 5.7.3",
    "vendor": "fastify",
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    "ai_score": 0
}