ByteDance DeerFlow Path Traversal and Arbitrary File Write via Bootstrap Mode_CVE-2026-40518

{
    "lastseen": "",
    "description": "ByteDance DeerFlow before commit\u00a02176b2b contains a path traversal and arbitrary file write vulnerability in bootstrap-mode custom-agent creation where the agent name validation is bypassed. Attackers can supply traversal-style values or absolute paths as the agent name to influence directory creation and write files outside the intended custom-agent directory, potentially achieving arbitrary file write on the system subject to filesystem permissions.",
    "published": "2026-04-17T16:43:42.387Z",
    "modified": "2026-04-17T16:43:42.387Z",
    "type": "cve",
    "title": "ByteDance DeerFlow Path Traversal and Arbitrary File Write via Bootstrap Mode",
    "source": "VulnCheck",
    "references": "https://github.com/bytedance/deer-flow/pull/2274\nhttps://github.com/bytedance/deer-flow/commit/2176b2bbfccfce25ceee08318813f96d843a13fd\nhttps://www.vulncheck.com/advisories/bytedance-deerflow-path-traversal-and-arbitrary-file-write-via-bootstrap-mode",
    "id": "CVE-2026-40518",
    "bulletinFamily": "",
    "cwe": [
        "CWE-22"
    ],
    "cvelist": null,
    "sourceData": "bytedance deer-flow 0",
    "sourceHref": "",
    "cvss": {
        "score": 7.1,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/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": "deer-flow",
    "version": "0",
    "vendor": "bytedance",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}