#VU120187 Uncaught exception in MCP Python SDK - CVE-2025-53366
Published: December 18, 2025
Vulnerability identifier: #VU120187
Vulnerability risk: Medium
CVSSv4.0: 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:U/U:Green
CVE-ID: CVE-2025-53366
CWE-ID: CWE-248
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
MCP Python SDK
MCP Python SDK
Software vendor:
Model Context Protocol
Model Context Protocol
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an unhandled exception when processing malformed requests. A remote attacker can send specially crafted requests to the application and perform a denial of service attack.
Remediation
Install updates from vendor's website.