OS Command Injection Affecting mcp-atlassian package, versions <0.23.0-r0


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.74% (51st percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-MCPATLASSIAN-18015563
  • published19 Jul 2026
  • disclosed3 Apr 2026

Introduced: 3 Apr 2026

CVE-2025-64340  (opens in a new tab)
CWE-78  (opens in a new tab)

How to fix?

Upgrade Chainguard mcp-atlassian to version 0.23.0-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mcp-atlassian package and not the mcp-atlassian package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1