frost-core: refresh shares with smaller min_signers will reduce group security_CVE-2025-58359

{
    "lastseen": "",
    "description": "ZF FROST is a Rust implementation of FROST (Flexible Round-Optimised Schnorr Threshold signatures). In versions 2.0.0 through 2.1.0, refresh shares with smaller min_signers will reduce security of group. The inability to change min_signers (i.e. the threshold) with the refresh share functionality (frost_core::keys::refresh module) was not made clear to users. Using a smaller value would not decrease the threshold, and attempts to sign using a smaller threshold would fail. Additionally, after refreshing the shares with a smaller threshold, it would still be possible to sign with the original threshold, potentially causing a security loss to the participant's shares. This issue is fixed in version 2.2.0.",
    "published": "2025-09-04T23:50:45.746Z",
    "modified": "2025-09-04T23:50:45.746Z",
    "type": "cve",
    "title": "frost-core: refresh shares with smaller min_signers will reduce group security",
    "source": "GitHub_M",
    "references": "https://github.com/ZcashFoundation/frost/security/advisories/GHSA-wgq8-vr6r-mqxm\nhttps://github.com/ZcashFoundation/frost/commit/379ef689c733b3d9c80fd409071d4f3af4dafed2\nhttps://github.com/ZcashFoundation/frost/releases/tag/frost-core%2Fv2.2.0",
    "id": "CVE-2025-58359",
    "bulletinFamily": "",
    "cwe": [
        "CWE-325"
    ],
    "cvelist": null,
    "sourceData": "ZcashFoundation frost >= 2.0.0, < 2.2.0",
    "sourceHref": "",
    "cvss": {
        "score": 6,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/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": "frost",
    "version": ">= 2.0.0, < 2.2.0",
    "vendor": "ZcashFoundation",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}