CVE-2026-59950
8.1 · HIGHOverview
CVE-2026-59950 is a high-severity vulnerability affecting lfprojects mcp_python_sdk. It was published on July 15, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to 1.28.1, the deprecated mcp.server.websocket.websocket_server transport accepted WebSocket handshakes without applying Host or Origin header validation, leaving no SDK-level way to restrict which origins could connect to applications that exposed that transport. This issue is fixed in version 1.28.1.
Remediation
Check the references section for vendor advisories and patches from lfprojects. Update mcp_python_sdk to the latest patched version. 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.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| lfprojects | mcp_python_sdk | >= 0, < 1.28.1 | Affected |
References
Frequently Asked Questions
What is CVE-2026-59950?
CVE-2026-59950 is a high-severity vulnerability affecting lfprojects mcp_python_sdk. It was published on July 15, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
How severe is CVE-2026-59950?
This vulnerability has a CVSS 3.1 base score of 8.1, 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-2026-59950?
Check the references section for vendor advisories and patches from lfprojects. Update mcp_python_sdk to the latest patched version. 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-2026-59950?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-59950 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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