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.
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Fri, 03 Apr 2026 17:45:00 +0000
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| 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 | |
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-04-03T16:12:58.401Z
Reserved: 2025-10-30T17:40:52.030Z
Link: CVE-2025-64340
Updated: 2026-04-03T16:12:01.061Z
Status : Received
Published: 2026-04-03T16:16:23.010
Modified: 2026-04-03T16:16:23.010
Link: CVE-2025-64340
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OpenCVE Enrichment
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