{"id":"CVE-2026-55604","sourceIdentifier":"security-advisories@github.com","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":"security-advisories@github.com","affectedData":[{"vendor":"arikusi","product":"deepseek-mcp-server","versions":[{"version":">= 1.4.2, < 1.7.0","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","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":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-639"}]}],"references":[{"url":"https://github.com/arikusi/deepseek-mcp-server/releases/tag/v1.7.0","source":"security-advisories@github.com"},{"url":"https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578","source":"security-advisories@github.com"},{"url":"https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}