FastMCP is the standard framework for building MCP applications. Prior to version 3.2.0, server names containing shell metacharacters (e.g., &) can cause command injection on Windows when passed to fastmcp install claude-code or fastmcp install gemini-cli. These install paths use subprocess.run() with a list argument, but on Windows the target CLIs often resolve to .cmd wrappers that are executed through cmd.exe, which interprets metacharacters in the flattened command string. This issue has been patched in version 3.2.0.
History

Fri, 03 Apr 2026 17:45:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 03 Apr 2026 16:30:00 +0000

Type Values Removed Values Added
Description FastMCP is the standard framework for building MCP applications. Prior to version 3.2.0, server names containing shell metacharacters (e.g., &) can cause command injection on Windows when passed to fastmcp install claude-code or fastmcp install gemini-cli. These install paths use subprocess.run() with a list argument, but on Windows the target CLIs often resolve to .cmd wrappers that are executed through cmd.exe, which interprets metacharacters in the flattened command string. This issue has been patched in version 3.2.0.
Title FastMCP has a Command Injection vulnerability - Gemini CLI
Weaknesses CWE-78
References
Metrics cvssV3_1

{'score': 6.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-04-03T16:12:58.401Z

Reserved: 2025-10-30T17:40:52.030Z

Link: CVE-2025-64340

cve-icon Vulnrichment

Updated: 2026-04-03T16:12:01.061Z

cve-icon NVD

Status : Received

Published: 2026-04-03T16:16:23.010

Modified: 2026-04-03T16:16:23.010

Link: CVE-2025-64340

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.