RustFS: Internode RPC HMAC secret falls back to public default credential, enabling peer impersonation_CVE-2026-45039

{
    "lastseen": "",
    "description": "RustFS is a distributed object storage system built in Rust. Prior to 1.0.0-beta.2, the internode RPC layer authenticates every request with an HMAC-SHA256 signature using a shared secret. The function that produces this secret, get_shared_secret() in crates/ecstore/src/rpc/http_auth.rs, falls back to the public, source-tree-embedded DEFAULT_SECRET_KEY = \"rustfsadmin\" when neither the RUSTFS_RPC_SECRET environment variable nor the global S3 secret key has been configured. This vulnerability is fixed in 1.0.0-beta.2.",
    "published": "2026-05-28T18:39:54.794Z",
    "modified": "2026-05-28T18:39:54.794Z",
    "type": "cve",
    "title": "RustFS: Internode RPC HMAC secret falls back to public default credential, enabling peer impersonation",
    "source": "GitHub_M",
    "references": "https://github.com/rustfs/rustfs/security/advisories/GHSA-r5qv-rc46-hv8q",
    "id": "CVE-2026-45039",
    "bulletinFamily": "",
    "cwe": [
        "CWE-798",
        "CWE-1392"
    ],
    "cvelist": null,
    "sourceData": "rustfs rustfs < 1.0.0-beta.2",
    "sourceHref": "",
    "cvss": {
        "score": 9.8,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "rustfs",
    "version": "< 1.0.0-beta.2",
    "vendor": "rustfs",
    "ai_description": "Internode RPC HMAC secret falls back to public default credential, enabling peer impersonation",
    "ai_severity": "Critical",
    "ai_vendor": "RustFS",
    "ai_product": "RustFS",
    "ai_version": "< 1.0.0-beta.2",
    "ai_score": 9.8
}