GCD AI RADAR
incidents/AIR-2026-0807

CVE-2026-59950: MCP Python SDK WebSocket server lacks Host and Origin validation

Attack on AI2 Disclosed vulnerabilityInfrastructure vulnerability

The deprecated WebSocket server transport in the MCP Python SDK accepts handshakes without validating Host or Origin headers. This exposes applications exposing this transport to potential cross-site connection vulnerabilities.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

Details

type
Attack on AI
An AI model, agent or AI-powered product was the thing exploited, abused or leaked.
categories
  • Infrastructure vulnerability
    CVEs and advisories in AI frameworks, inference servers, MCP servers, AI developer tools and hosting stacks.
owasp llm top 10
mitre atlas
no technique for these categories
Both rows are derived from the type and categories (OWASP 2025 edition, ATLAS release 2026.09), not classified per record. How
severity
2 · Disclosed vulnerability
CVE or vendor advisory, patched or patchable, no confirmed exploitation.
targets
Framework / tooling
products
MCP Python SDK
incident date
16 Jul 2026
first reported
15 Jul 2026
origin
GitHub Advisory Database
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
classifier confidence
0.95 · published at or above 0.80; see the methodology
tags
CVE-2026-59950 · mcp · websocket
record
created 2026-10-18 07:00Z · updated 2026-10-18 10:04Z · json

Sources · 2

  1. 2026-07-15
    CVE-2026-59950: The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP).
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-59950
  2. 2026-07-16
    CVE-2026-59950: MCP Python SDK: WebSocket server transport does not support Host/Origin validation
    GitHub Advisory Database · github.com/advisories/GHSA-vj7q-gjh5-988w

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