CVE Watch28 oct 2026

CVE-2026-116686

The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients. From 1.10.0 until 1.30.0 an

CVSS

6.5

Medio

EPSS

0.3%

p27

KEV

—

Exploit Today

0-100

Publicado: 27 oct 2026 · Última mod.: 28 oct 2026 · CWE-918

EPSS · 30d

0.3%EPSS · 30 días0.3%

2026-10-282026-11-07

Descripción técnica

The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients. From 1.10.0 until 1.30.0 and 2.2.0, ClientSession, ClientSessionGroup, and Client tool calls validate server-declared outputSchema documents with jsonschema's default resolver, causing an unresolved $ref value to fetch an HTTP, HTTPS, or file URL from the client's network and filesystem context. A server can trigger blind requests or local-file reads and can stall every session in the process because resolution runs synchronously on the event loop without a timeout. This issue is fixed in versions 1.30.0 and 2.2.0.

Referencias oficiales

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