Hono: Body Limit Middleware can be bypassed on AWS Lambda by understating `Content-Length`_CVE-2026-54288

{
    "lastseen": "",
    "description": "Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, the Body Limit Middleware trusts the request's Content-Length header to decide whether a body is within the limit. On AWS Lambda (API Gateway v1/v2, ALB, VPC Lattice, and Lambda@Edge) the body is delivered fully buffered and the adapter builds the request with the client-declared Content-Length, which need not match the actual payload. A client can declare a tiny Content-Length while sending a much larger body, slipping past the limit. This vulnerability is fixed in 4.12.25.",
    "published": "2026-06-22T17:18:24.532Z",
    "modified": "2026-06-22T17:18:24.532Z",
    "type": "cve",
    "title": "Hono: Body Limit Middleware can be bypassed on AWS Lambda by understating `Content-Length`",
    "source": "GitHub_M",
    "references": "https://github.com/honojs/hono/security/advisories/GHSA-rv63-4mwf-qqc2",
    "id": "CVE-2026-54288",
    "bulletinFamily": "",
    "cwe": [
        "CWE-345"
    ],
    "cvelist": null,
    "sourceData": "honojs hono < 4.12.25",
    "sourceHref": "",
    "cvss": {
        "score": 6.5,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
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        "availabilityImpact": "",
        "cvssV3": {
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "hono",
    "version": "< 4.12.25",
    "vendor": "honojs",
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}