Is there a public exploit for CVE-2025-53365?

No public exploit for CVE-2025-53365 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2025-53365?

CVE-2025-53365 scores CVSS 8.7 (v4.0), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.42%.

What does CVE-2025-53365 affect?

CVE-2025-53365 affects modelcontextprotocol mcp. It is part of the AI and agent stack (Model Context Protocol).

8.7 High

The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP).

CVE-2025-53365

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.

Part of the AI stack

This affects Model Context Protocol, in MCP & tool servers.

Assessment

CVSS: 8.7 (v4.0)
Severity: High
EPSS: 0.42% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 4 July 2025
Last updated: 16 July 2026
Affected: modelcontextprotocol · python-sdk · mcp
Weakness: CWE-248
Assigner: security-advisories@github.com

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

At the source

References

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