CVE-2026-52870

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.

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Produits concernés

• modelcontextprotocol python-sdk
• Lfprojects mcp python sdk

Scores CVSS

Faiblesses (CWE)

• CWE-862

Références

• https://github.com/modelcontextprotocol/python-sdk/commit/62137874ff26dd74d2fea80ff528a7fd9ca7a5e7 Patch
• https://github.com/modelcontextprotocol/python-sdk/pull/2720 Issue TrackingPatch
• https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.27.2 Release Notes
• https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-hvrp-rf83-w775 Vendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories