Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring_CVE-2026-42462

{
    "lastseen": "",
    "description": "Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its Linked Data Signature, allowing them to alter a third-party signed activity they have received. Versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3 fix the issue.",
    "published": "2026-06-10T20:22:35.383Z",
    "modified": "2026-06-10T20:22:35.383Z",
    "type": "cve",
    "title": "Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring",
    "source": "GitHub_M",
    "references": "https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367\nhttps://github.com/fedify-dev/fedify/releases/tag/2.2.3",
    "id": "CVE-2026-42462",
    "bulletinFamily": "",
    "cwe": [
        "CWE-180",
        "CWE-347",
        "CWE-436",
        "CWE-1289"
    ],
    "cvelist": null,
    "sourceData": "fedify-dev fedify >= 2.2.0, < 2.2.3\nfedify-dev fedify >= 2.1.0, < 2.1.14\nfedify-dev fedify >= 2.0.0, < 2.0.18\nfedify-dev fedify >= 1.10.0, < 1.10.10\nfedify-dev fedify < 1.9.11",
    "sourceHref": "",
    "cvss": {
        "score": 7,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L",
        "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": "fedify",
    "version": ">= 2.2.0, < 2.2.3",
    "vendor": "fedify-dev",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}