CVE WatchJul 17, 2026

CVE-2026-52870

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 ha

CVSS

7.6

High

EPSS

0.4%

p33

KEV

—

Exploit Today

0-100

Published: Jul 15, 2026 · Last modified: Jul 17, 2026 · CWE-862

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-08-242026-09-21

Technical description

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.

Official references

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