{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "1.2.0"
              },
              {
                "fixed": "1.2.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "65c174ee95ac6a6fd36b18b63d0b33d97e76b770"
            }
          ],
          "repo": "https://github.com/modeltc/lightllm",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103042.json"
  },
  "details": "LightLLM through 1.2.0 contains a memory exhaustion vulnerability in the NCCL control channel when started with --pd_trans_mode nccl, allowing unauthenticated attackers to exhaust KV-transfer worker memory. Attackers can call the exposed_set_value method to store unbounded key-value pairs without size limits, causing the worker process to crash and triggering node failure.",
  "id": "CVE-2026-103042",
  "modified": "2026-10-03T03:30:58.675750024Z",
  "published": "2026-09-29T22:51:01.631Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103042.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103042"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/lightllm-through-1.2.0-unauthenticated-memory-exhaustion-via-nccl-control-channel-set-value"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/ModelTC/LightLLM/issues/1595"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ModelTC/LightLLM"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ModelTC/lightllm"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode_backend/pd/base_kv_move_manager.py#L121-L122"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode_backend/pd/nccl_kv_transporter.py#L416-L420"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode_backend/pd/nccl_kv_transporter.py#L474-L485"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "LightLLM through 1.2.0 Unauthenticated Memory Exhaustion via NCCL Control Channel set_value"
}