vLLM API endpoints vulnerable to Denial of Service Attacks

{
  "id": "6f9ef3e460e7ee8d5f0ee9be1bd477fab7e1ddf5b4d5a6cbd6dd9c1e9a24cfd7",
  "url": "https://osv.dev/vulnerability/CVE-2025-48956",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "vLLM API endpoints vulnerable to Denial of Service Attacks",
    "summary": "vLLM is an inference and serving engine for large language models (LLMs). From 0.1.0 to before 0.10.1.1, a Denial of Service (DoS) vulnerability can be triggered by sending a single HTTP GET request with an extremely large header to an HTTP endpoint. This results in server memory exhaustion, potentially leading to a crash or unresponsiveness. The attack does not require authentication, making it exploitable by any remote user. This vulnerability is fixed in 0.10.1.1.",
    "evidence": "osv:CVE-2025-48956",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-48956",
      "aliases": [
        "CVE-2025-48956",
        "GHSA-rxc4-3w6r-4v47",
        "PYSEC-2026-2021"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/vllm-project/vllm",
              "type": "GIT",
              "events": [
                {
                  "introduced": "67d96c29fba9b72cb4c4edbc26211c208a00ebdd"
                },
                {
                  "fixed": "1da94e673c257373280026f75ceb4effac80e892"
                },
                {
                  "fixed": "d8b736f913a59117803d6701521d2e4861701944"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.1.0"
                      },
                      {
                        "fixed": "0.10.1.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d8b736f913a59117803d6701521d2e4861701944"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.10.1",
            "v0.10.1rc1",
            "v0.10.0rc2",
            "v0.10.0",
            "v0.10.0rc1",
            "v0.9.2rc1",
            "v0.9.1rc2",
            "v0.9.1",
            "v0.9.1rc1",
            "v0.9.0",
            "v0.8.4",
            "v0.8.3rc1",
            "v0.8.2",
            "v0.8.1",
            "v0.8.0rc2",
            "v0.8.0rc1",
            "v0.7.3",
            "v0.7.2",
            "v0.7.1",
            "v0.7.0",
            "v0.6.6.post1",
            "v0.6.6",
            "v0.6.5",
            "v0.6.4.post1",
            "v0.6.4",
            "v0.6.3.post1",
            "v0.6.3",
            "v0.6.2",
            "v0.6.1.post2",
            "v0.6.1.post1",
            "v0.6.1",
            "v0.6.0",
            "v0.5.5",
            "v0.5.4",
            "v0.5.3.post1",
            "v0.5.3",
            "v0.5.2",
            "v0.5.1",
            "v0.5.0.post1",
            "v0.5.0",
            "v0.4.3",
            "v0.4.2",
            "v0.4.1",
            "v0.4.0.post1",
            "v0.4.0",
            "v0.3.3",
            "v0.3.2",
            "v0.3.1",
            "v0.3.0",
            "v0.2.7",
            "v0.2.6",
            "v0.2.5",
            "v0.2.4",
            "v0.2.3",
            "v0.2.2",
            "v0.2.1",
            "v0.2.0",
            "v0.1.7",
            "v0.1.6",
            "v0.1.5",
            "v0.1.4",
            "v0.1.3",
            "v0.1.2",
            "v0.1.1",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-48956.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.719971607Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/48xxx/CVE-2025-48956.json",
        "https://github.com/vllm-project/vllm/security/advisories/GHSA-rxc4-3w6r-4v47",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-48956",
        "https://github.com/vllm-project/vllm/commit/d8b736f913a59117803d6701521d2e4861701944",
        "https://github.com/vllm-project/vllm/pull/23267"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-400"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/48xxx/CVE-2025-48956.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-48956",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519234,
  "published_at": "2025-08-21T14:41:03.889+00:00"
}