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archive/Patch now/AIR-2026-0538
closedclosed 31 Mar 2026Patch now2 Disclosed vulnerabilityAI

CVE-2025-64340: FastMCP Command Injection via Server Names

FastMCP

Server names containing shell metacharacters can cause command injection on Windows when passed to FastMCP CLI installation commands. The vulnerability affects wrappers interpreted through cmd.exe during tool setup.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
6.7
EPSS
0.01 · top 45% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
31 Mar 2026
last update
31 Mar 2026
CVE ids
CVE-2025-64340other records

Timeline · 1

  1. 31 Mar 2026CVE-2025-64340: FastMCP has a Command Injection vulnerability - Gemini CLI

Sources · 1

Advisories and databases

  1. 2026-03-31
    CVE-2025-64340: FastMCP has a Command Injection vulnerability - Gemini CLI
    GitHub Advisory Database · github.com/advisories/GHSA-m8x7-r2rg-vh5g

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
command-injection
dates
happened 31 Mar 2026 · first reported 31 Mar 2026
origin
GitHub Advisory Database
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 07:00Z · updated 2026-10-18 07:00Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2025-64340: FastMCP Command Injection via Server Names

https://gcdradar.vercel.app/incidents/cve-2025-64340-fastmcp-command-injection-via-server-names · AIR-2026-0538 · closed 2026-03-31

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-03-31
- AI role: Attack on AI
- Products: FastMCP
- CVE ids: CVE-2025-64340
- CVSS: 6.7

## Summary

Server names containing shell metacharacters can cause command injection on Windows when passed to FastMCP CLI installation commands. The vulnerability affects wrappers interpreted through cmd.exe during tool setup.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-03-31: CVE-2025-64340: FastMCP has a Command Injection vulnerability - Gemini CLI (https://github.com/advisories/GHSA-m8x7-r2rg-vh5g)

## Sources

- 2026-03-31 GitHub Advisory Database: CVE-2025-64340: FastMCP has a Command Injection vulnerability - Gemini CLI https://github.com/advisories/GHSA-m8x7-r2rg-vh5g

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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