CVE-2026-55604

{
  "id": "CVE-2026-55604",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-09T22:17:06.247",
  "lastModified": "2026-10-25T17:10:00.197",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "DeepSeek MCP Server is an MCP server for DeepSeek V4. Starting in version 1.4.2 and prior to version 1.7.0, the process-global `SessionStore` accepts caller-supplied `session_id` values without binding them to any authenticated principal or transport session. An attacker can enumerate active session IDs via `deepseek_sessions`, then reuse a victim-controlled `session_id` in `deepseek_chat` to retrieve and continue the victim's conversation context. Version 1.7.0 contains a patch."
    },
    {
      "lang": "es",
      "value": "DeepSeek MCP Server es un servidor MCP para DeepSeek V4. A partir de la versión 1.4.2 y antes de la versión 1.7.0, el ’SessionStore’ global del proceso acepta valores de ’session_id’ proporcionados por el llamador sin vincularlos a ningún principal autenticado o sesión de transporte. Un atacante puede enumerar IDs de sesión activas a través de ’deepseek_sessions’, luego reutilizar un ’session_id’ controlado por la víctima en ’deepseek_chat’ para recuperar y continuar el contexto de conversación de la víctima. La versión 1.7.0 contiene un parche."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "arikusi",
          "product": "deepseek-mcp-server",
          "versions": [
            {
              "version": ">= 1.4.2, < 1.7.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.7
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-10T14:40:34.870840Z",
          "id": "CVE-2026-55604",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-639"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/arikusi/deepseek-mcp-server/releases/tag/v1.7.0",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}