Nebula Has Possible Blocklist Bypass via ECDSA Signature Malleability_CVE-2026-25793

{
    "lastseen": "",
    "description": "Nebula is a scalable overlay networking tool. In versions from 1.7.0 to 1.10.2, when using P256 certificates (which is not the default configuration), it is possible to evade a blocklist entry created against the fingerprint of a certificate by using ECDSA Signature Malleability to use a copy of the certificate with a different fingerprint. This issue has been patched in version 1.10.3.",
    "published": "2026-02-06T22:55:36.011Z",
    "modified": "2026-02-06T22:55:36.011Z",
    "type": "cve",
    "title": "Nebula Has Possible Blocklist Bypass via ECDSA Signature Malleability",
    "source": "GitHub_M",
    "references": "https://github.com/slackhq/nebula/security/advisories/GHSA-69x3-g4r3-p962\nhttps://github.com/slackhq/nebula/commit/f573e8a26695278f9d71587390fbfe0d0933aa21",
    "id": "CVE-2026-25793",
    "bulletinFamily": "",
    "cwe": [
        "CWE-347"
    ],
    "cvelist": null,
    "sourceData": "slackhq nebula >= 1.7.0, < 1.10.3",
    "sourceHref": "",
    "cvss": {
        "score": 7.6,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/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": "nebula",
    "version": ">= 1.7.0, < 1.10.3",
    "vendor": "slackhq",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}