Bug 2376485 (CVE-2025-53366) - CVE-2025-53366 mcp: MCP SDK Denial of Service Vulnerability
Summary: CVE-2025-53366 mcp: MCP SDK Denial of Service Vulnerability
Keywords:
Status: NEW
Alias: CVE-2025-53366
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-07-04 23:01 UTC by OSIDB Bzimport
Modified: 2025-07-07 13:38 UTC (History)
11 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2025-07-04 23:01:19 UTC 
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.
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