Apache Fory: PyFory ReduceSerializer Incomplete Policy Enforcement_CVE-2026-48207

{
    "lastseen": "",
    "description": "Deserialization of untrusted data in Apache Fory PyFory. PyFory's ReduceSerializer could bypass documented DeserializationPolicy validation hooks during reduce-state restoration and global-name resolution. An application is vulnerable if it deserializes attacker-controlled data using PyFory Python-native mode with strict mode disabled and relies on DeserializationPolicy to restrict unsafe classes, functions, or module attributes.\n\nThis issue affects Apache Fory: from before 1.0.0.\n\nMitigation: Users of Apache Fory are recommended to upgrade to version 1.0.0 or later, which enforces DeserializationPolicy validation for the affected ReduceSerializer paths and thus fixes this issue.",
    "published": "2026-05-21T15:51:12.292Z",
    "modified": "2026-05-21T17:10:52.297Z",
    "type": "cve",
    "title": "Apache Fory: PyFory ReduceSerializer Incomplete Policy Enforcement",
    "source": "apache",
    "references": "https://fory.apache.org/security/#cve-2026-48207-pyfory-reduceserializer-deserializationpolicy-bypass",
    "id": "CVE-2026-48207",
    "bulletinFamily": "",
    "cwe": [
        "CWE-502"
    ],
    "cvelist": null,
    "sourceData": "Apache Software Foundation Apache Fory 0.13.0",
    "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": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Apache Fory",
    "version": "0.13.0",
    "vendor": "Apache Software Foundation",
    "ai_description": "Deserialization of untrusted data in PyFory's ReduceSerializer could bypass validation hooks",
    "ai_severity": "Critical",
    "ai_vendor": "Apache Software Foundation",
    "ai_product": "Apache Fory",
    "ai_version": "0.13.0",
    "ai_score": 9.8
}