Signature Threshold Bypass in awslabs/tough Delegated Roles_CVE-2026-6966

{
    "lastseen": "",
    "description": "Improper verification of cryptographic signature uniqueness in delegated role validation in awslabs/tough before tough-v0.22.0 allows remote authenticated users to bypass the TUF signature threshold requirement by duplicating a valid signature, causing the client to accept forged delegated role metadata.\n\nWe recommend you upgrade to tough-v0.22.0 / tuftool-v0.15.0.",
    "published": "2026-04-24T19:38:24.907Z",
    "modified": "2026-04-24T19:59:12.012Z",
    "type": "cve",
    "title": "Signature Threshold Bypass in awslabs/tough Delegated Roles",
    "source": "AMZN",
    "references": "https://aws.amazon.com/security/security-bulletins/2026-019-aws/\nhttps://github.com/awslabs/tough/releases/tag/tough-v0.22.0\nhttps://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0\nhttps://crates.io/crates/tough/0.22.0\nhttps://crates.io/crates/tuftool/0.15.0\nhttps://github.com/awslabs/tough/security/advisories/GHSA-8m7c-8m39-rv4x",
    "id": "CVE-2026-6966",
    "bulletinFamily": "",
    "cwe": [
        "CWE-347"
    ],
    "cvelist": null,
    "sourceData": "",
    "sourceHref": "",
    "cvss": {
        "score": 5.3,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N",
        "version": "3.1"
    },
    "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": "tough",
    "version": "0.22.0",
    "vendor": "AWS",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}