7.6
High
CVE-2026-52870 The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP)
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| python-sdk 1.23 | 1.23.0 → < 1.27.2 | 1.27.2 |
References
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com
Timeline
- Published
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