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CVE-2026-116686

6.5 medium SSVC exploitation: none Deferred
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 4

  1. StatusPublished → DeferredNVD modified 2026-10-28 15:24
  2. StatusReceived → PublishedNVD modified 2026-10-27 19:29
  3. StatusPublished → ReceivedNVD modified 2026-10-27 20:17
  4. First seenCVSS 6.5 · modelcontextprotocolNVD modified 2026-10-27 19:29

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 7