LightLLM through 1.2.0 Unauthenticated Memory Exhaustion via NCCL Control Channel set_value

{
  "id": "b2f35bd93ecada6098a96f64c0af66ffe5284885b3fce1b963b7c38d4ce065ac",
  "url": "https://osv.dev/vulnerability/CVE-2026-103042",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "LightLLM through 1.2.0 Unauthenticated Memory Exhaustion via NCCL Control Channel set_value",
    "summary": "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.",
    "evidence": "osv:CVE-2026-103042",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-103042",
      "aliases": [
        "CVE-2026-103042"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/modeltc/lightllm",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "65c174ee95ac6a6fd36b18b63d0b33d97e76b770"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.2.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.2.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.2.0",
            "v1.1.0",
            "v1.0.1",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103042.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.798842564Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103042.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-103042",
        "https://www.vulncheck.com/advisories/lightllm-through-1.2.0-unauthenticated-memory-exhaustion-via-nccl-control-channel-set-value",
        "https://github.com/ModelTC/LightLLM/issues/1595",
        "https://github.com/ModelTC/LightLLM",
        "https://github.com/ModelTC/lightllm",
        "https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode_backend/pd/base_kv_move_manager.py#L121-L122",
        "https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode_backend/pd/nccl_kv_transporter.py#L416-L420",
        "https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode_backend/pd/nccl_kv_transporter.py#L474-L485"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-770"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103042.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-103042",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497601,
  "published_at": "2026-09-29T22:51:01.631+00:00"
}