CVEvulnerability

CVE-2025-53366

8.7 HIGH Published 2025-07-04 Modified 2026-06-17 Official page ↗

Status: Deferred
Published: 2025-07-04
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 4.0 ([email protected]): 8.7 HIGH — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weaknesses: CWE-248

Description

The MCP Python SDK, called `mcp` on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to version 1.9.4, a validation error in the MCP SDK can cause an unhandled exception when processing malformed requests, resulting in service unavailability (500 errors) until manually restarted. Impact may vary depending on the deployment conditions, and presence of infrastructure-level resilience measures. Version 1.9.4 contains a patch for the issue.

Weakness · CWE (1)

CWE-248 Uncaught Exception weakness

References

https://github.com/modelcontextprotocol/python-sdk/commit/29c69e6a47d0104d0afcea6ac35e7ab02fde809a github.com
https://github.com/modelcontextprotocol/python-sdk/pull/822 github.com
https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-3qhf-m339-9g5v github.com

CVE-2025-53366

Description

Related

Weakness · CWE (1)

References