CVE-2025-53365
High
Description
The MCP Python SDK, called `mcp` on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to version 1.10.0, if a client deliberately triggers an exception after establishing a streamable HTTP session, this can lead to an uncaught ClosedResourceError on the server side, causing the server to crash and requiring a restart to restore service. Impact may vary depending on the deployment conditions, and presence of infrastructure-level resilience measures. Version 1.10.0 contains a patch for the issue.
SeverityHigh
CVSS8.7
Exploit probability—
ProductMcp
PublishedJul 4, 2025
First seenJul 4, 2025
Weakness typeCWE-248CWE-248
How to fix
Update
- mcp1.10.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mcpPyPI | v < 1.10.0 | 1.10.0 |
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