Fiber Susceptible to Crash via `BodyParser` Due to Unvalidated Large Slice Index in Decoder_CVE-2025-54801

{
    "lastseen": "",
    "description": "Fiber is an Express inspired web framework written in Go. In versions 2.52.8 and below, when using Fiber's Ctx.BodyParser to parse form data containing a large numeric key that represents a slice index (e.g., test.18446744073704), the application crashes due to an out-of-bounds slice allocation in the underlying schema decoder. The root cause is that the decoder attempts to allocate a slice of length idx + 1 without validating whether the index is within a safe or reasonable range. If the idx is excessively large, this leads to an integer overflow or memory exhaustion, causing a panic or crash. This is fixed in version 2.52.9.",
    "published": "2025-08-05T23:33:28.221Z",
    "modified": "2025-08-07T14:00:09.981Z",
    "type": "cve",
    "title": "Fiber Susceptible to Crash via `BodyParser` Due to Unvalidated Large Slice Index in Decoder",
    "source": "GitHub_M",
    "references": "https://github.com/gofiber/fiber/security/advisories/GHSA-qx2q-88mx-vhg7\nhttps://github.com/gofiber/fiber/commit/e115c08b8f059a4a031b492aa9eef0712411853d",
    "id": "CVE-2025-54801",
    "bulletinFamily": "",
    "cwe": [
        "CWE-789"
    ],
    "cvelist": null,
    "sourceData": "gofiber fiber < 2.52.9",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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": "fiber",
    "version": "< 2.52.9",
    "vendor": "gofiber",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}