CVE-2026-52869
CVE-2026-52869 · MCP Python SDK: HTTP transports serve session requests without verifying the authenticated principal
Esta página presenta datos de fuentes públicas de vulnerabilidades. Consulta el aviso original antes de actualizar.
The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to 1.27.2, the SSE and stateful Streamable HTTP transports mcp.server.sse.SseServerTransport and mcp.server.streamable_http_manager.StreamableHTTPSessionManager route requests to existing sessions using only the session_id query parameter or Mcp-Session-Id header without verifying the authenticated principal that created the session, allowing a different bearer-token-authenticated client with a known session ID to inject JSON-RPC messages into that session. This issue is fixed in version 1.27.2.
CVSS 7.1 · Alta · EPSS 0,5% · Corrección disponible
- Publicación
- Actualización
Pila tecnológica: python
Productos y versiones afectados
python-sdk
- Versiones
- < 1.27.2: Afectada
Sin corrección publicada
mcp PyPI
- Versiones
- 0.9.1
- 1.0.0
- 1.1.0
- 1.1.1
- 1.1.2
- 1.1.3
- 1.10.0
- 1.10.1
- 1.11.0
- 1.12.0
- 1.12.1
- 1.12.2
- 1.12.3
- 1.12.4
- 1.13.0
- 1.13.1
- 1.14.0
- 1.14.1
- 1.15.0
- 1.16.0
- 1.17.0
- 1.18.0
- 1.19.0
- 1.2.0
- 1.2.0rc1
- 1.2.1
- 1.20.0
- 1.21.0
- 1.21.1
- 1.21.2
- 1.22.0
- 1.23.0
- 1.23.1
- 1.23.2
- 1.23.3
- 1.24.0
- 1.25.0
- 1.26.0
- 1.27.0
- 1.27.1
- 1.3.0
- 1.3.0rc1
- 1.4.0
- 1.4.1
- 1.5.0
- 1.6.0
- 1.7.0
- 1.7.1
- 1.8.0
- 1.8.1
- 1.9.0
- 1.9.1
- 1.9.2
- 1.9.3
- 1.9.4
- Intervalos de versiones afectados
- ECOSYSTEM: < 1.27.2
Actualiza a 1.27.2
Fuentes originales
- https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-jpw9-pfvf-9f58
- https://github.com/modelcontextprotocol/python-sdk/pull/2690
- https://github.com/modelcontextprotocol/python-sdk/pull/2719
- https://github.com/modelcontextprotocol/python-sdk/commit/1abcca2408a6b50e10ec601181f63f9978705c00
- https://github.com/modelcontextprotocol/python-sdk/commit/ce267b6fc515dc4efc1dc70b6975b16ff0feef0a
- https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.27.2
- https://nvd.nist.gov/vuln/detail/CVE-2026-52869