Fiber insecurely fallsback in utils.UUIDv4() / utils.UUID() — predictable / zero‑UUID on crypto/rand failure_CVE-2025-66630

{
    "lastseen": "",
    "description": "Fiber is an Express inspired web framework written in Go. Before 2.52.11, on Go versions prior to 1.24, the underlying crypto/rand implementation can return an error if secure randomness cannot be obtained. Because no error is returned by the Fiber v2 UUID functions, application code may unknowingly rely on predictable, repeated, or low-entropy identifiers in security-critical pathways. This is especially impactful because many Fiber v2 middleware components (session middleware, CSRF, rate limiting, request-ID generation, etc.) default to using utils.UUIDv4(). This vulnerability is fixed in 2.52.11.",
    "published": "2026-02-09T18:04:47.713Z",
    "modified": "2026-02-09T18:04:47.713Z",
    "type": "cve",
    "title": "Fiber insecurely fallsback in utils.UUIDv4() / utils.UUID() \u2014 predictable / zero\u2011UUID on crypto/rand failure",
    "source": "GitHub_M",
    "references": "https://github.com/gofiber/fiber/security/advisories/GHSA-68rr-p4fp-j59v\nhttps://github.com/gofiber/fiber/commit/eb874b6f6c5896b968d9b0ab2b56ac7052cb0ee1\nhttps://github.com/gofiber/fiber/releases/tag/v2.52.11",
    "id": "CVE-2025-66630",
    "bulletinFamily": "",
    "cwe": [
        "CWE-338"
    ],
    "cvelist": null,
    "sourceData": "gofiber fiber < 2.52.11",
    "sourceHref": "",
    "cvss": {
        "score": 9.2,
        "severity": "CRITICAL",
        "vector": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/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": "< 2.52.11",
    "vendor": "gofiber",
    "ai_description": "Fiber v2 UUID functions may return predictable, repeated, or low-entropy identifiers due to insecure fallback on crypto/rand failure",
    "ai_severity": "CRITICAL",
    "ai_vendor": "gofiber",
    "ai_product": "Fiber",
    "ai_version": "< 2.52.11",
    "ai_score": 9.2
}