{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "1.1.0"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0f5d0ccf98b654e77fe9b0d9de81bda19cb907ad"
            }
          ],
          "repo": "https://github.com/modeltc/lightllm",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-502"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26220.json"
  },
  "details": "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.",
  "id": "CVE-2026-26220",
  "modified": "2026-08-12T03:51:16.745849363Z",
  "published": "2026-02-17T01:52:03.650Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L310"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L331"
    },
    {
      "type": "WEB",
      "url": "https://lightllm-en.readthedocs.io/en/latest/index.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26220.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26220"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/lightllm-pd-mode-unsafe-deserialization-rce"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/ModelTC/LightLLM/issues/1213"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ModelTC/lightllm"
    },
    {
      "type": "EVIDENCE",
      "url": "https://chocapikk.com/posts/2026/lightllm-pickle-rce/"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "LightLLM \u003c= 1.1.0 PD Mode Unsafe Deserialization RCE"
}