Uncaught Exception Affecting mcp package, versions [,1.10.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-MCP-10734136
- published14 Jul 2025
- disclosed4 Jul 2025
- creditRich Harang
Introduced: 4 Jul 2025
CVE-2025-53365 (opens in a new tab)How to fix?
Upgrade mcp to version 1.10.0 or higher.
Overview
mcp is a Model Context Protocol SDK
Affected versions of this package are vulnerable to Uncaught Exception via the _receive_loop function in the shared/session.py file. An attacker can cause the server to crash and require a restart by deliberately triggering an exception after establishing a streamable HTTP session.