EUVD-2025-20093
GHSA-3qhf-m339-9g5v
8.7
CVSS 4.0
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CVSS Vector
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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Lifecycle Timeline
4
Patch Released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 16, 2026 - 02:42 vuln.today
EUVD ID Assigned
Mar 16, 2026 - 02:42 euvd
EUVD-2025-20093
CVE Published
Jul 04, 2025 - 22:15 nvd
HIGH 8.7
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.
Analysis
CVE-2025-53366 is a security vulnerability (CVSS 8.7). High severity vulnerability requiring prompt remediation.
Technical Context
Vulnerability type not specified by vendor. CVSS 8.7 indicates high severity.
Affected Products
['Unspecified product']
Remediation
Monitor vendor channels for patch availability.
Priority Score
44
Low
Medium
High
Critical
KEV: 0
EPSS: +0.0
CVSS: +44
POC: 0
Vendor Status
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External POC / Exploit Code
Leaving vuln.today
Destination URL
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Always review and test exploit code in a safe, isolated environment (VM/sandbox).
Verify the source reputation and cross-reference with known databases (Exploit-DB, GitHub Security).