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CVE-2026-52870

7.6 high SSVC exploitation: none Analyzed
NVD · CVE.org

The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). From 1.23.0 until 1.27.2, default handlers installed by server.experimental.enable_tasks() for tasks/list, tasks/get, tasks/result, and tasks/cancel operate only on task identifiers without recording the session that created each task, allowing any connected client to enumerate, read results from, consume messages for, or cancel other clients' tasks. This issue is fixed in version 1.27.2.

Fix

Patch, vendor advisory and mitigation references on NVD 3

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 7.6 · lfprojectsNVD modified 2026-10-24 21:10

Affected (CPE criteria) 1

  • cpe:2.3:a:lfprojects:mcp_python_sdk:*:*:*:*:*:*:*:*

References 4