LightLLM <= 1.1.0 PD Mode Unsafe Deserialization RCE_CVE-2026-26220

{
    "lastseen": "",
    "description": "LightLLM version 1.1.0 and prior contain an unauthenticated remote code execution vulnerability in PD (prefill-decode) disaggregation mode. The PD master node exposes WebSocket endpoints that receive binary frames and pass the data directly to pickle.loads() without authentication or validation. A remote attacker who can reach the PD master can send a crafted payload to achieve arbitrary code execution.",
    "published": "2026-02-17T01:52:03.650Z",
    "modified": "2026-02-17T01:52:03.650Z",
    "type": "cve",
    "title": "LightLLM <= 1.1.0 PD Mode Unsafe Deserialization RCE",
    "source": "VulnCheck",
    "references": "https://chocapikk.com/posts/2026/lightllm-pickle-rce/\nhttps://github.com/ModelTC/LightLLM/issues/1213\nhttps://lightllm-en.readthedocs.io/en/latest/index.html\nhttps://github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L310\nhttps://github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L331\nhttps://www.vulncheck.com/advisories/lightllm-pd-mode-unsafe-deserialization-rce",
    "id": "CVE-2026-26220",
    "bulletinFamily": "",
    "cwe": [
        "CWE-502"
    ],
    "cvelist": null,
    "sourceData": "ModelTC LightLLM 0",
    "sourceHref": "",
    "cvss": {
        "score": 9.3,
        "severity": "CRITICAL",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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": "LightLLM",
    "version": "0",
    "vendor": "ModelTC",
    "ai_description": "Unauthenticated remote code execution vulnerability in PD mode due to unsafe deserialization",
    "ai_severity": "Critical",
    "ai_vendor": "ModelTC",
    "ai_product": "LightLLM",
    "ai_version": "1.1.0",
    "ai_score": 9.3
}