Uncaught Resource Error in Model Context Protocol Python SDK
CVE-2025-53365

8.7HIGH

Key Information:

Vendor
CVE Published:
4 July 2025

What is CVE-2025-53365?

The MCP Python SDK, available on PyPI, is susceptible to a resource management issue wherein deliberate exceptions during an established streamable HTTP session can result in an uncaught ClosedResourceError. This error can destabilize server operations, necessitating a restart to restore service functionality. The impact may differ based on deployment specifics, including any underlying infrastructure resilience measures. The issue is resolved in version 1.10.0, which includes a patch to address this vulnerability.

Affected Version(s)

python-sdk < 1.10.0

References

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2025-53365 : Uncaught Resource Error in Model Context Protocol Python SDK