En resumen
- CVE-2026-9739 es una vulnerabilidad CRÍTICO (CVSS 9.4) que afecta a github.com/googleapis/mcp-toolbox.
- Probabilidad de explotación en los próximos 30 días (EPSS): 0.28%, mayor que el 20.4% de las vulnerabilidades.
- Solución: actualizar a 1.2.0 o posterior.
Description
Vulnerable to DNS rebinding attacks when using SSE (http://b/499408790). During the beta phase, we implemented allowed-origins and allowed-hosts flags to align with MCP security guidelines. However, the hardcoded Access-Control-Allow-Origin: * header in the SSE initialization handler was inadvertently retained. This vulnerability specifically impacts users connecting via Toolbox using SSE under specification v2024-11-05.
NVD description
Vulnerable to DNS rebinding attacks when using SSE (http://b/499408790). During the beta phase, we implemented `allowed-origins` and `allowed-hosts` flags to align with MCP security guidelines. However, the hardcoded `Access-Control-Allow-Origin: *` header in the SSE initialization handler was inadvertently retained. This vulnerability specifically impacts users connecting via Toolbox using SSE under specification v2024-11-05.
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