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CVE-2026-55604

8.6 · HIGH

DeepSeek MCP Server is an MCP server for DeepSeek V4.

Published Jul 9, 2026CWE-639EPSS 0.37%

Overview

CVE-2026-55604 is a high-severity vulnerability. It was published on July 9, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/arikusi/deepseek-mcp-server/releases/tag/v1.7.0GitHubgithub.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578GitHubgithub.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55604?

CVE-2026-55604 is a high-severity vulnerability. It was published on July 9, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

How severe is CVE-2026-55604?

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-55604?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55604?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55604 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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