CVE-2026-55157— Token Optimizer MCP: OS command injection in smart_user via username in get-user-info
Quick assessment
Affected
ooples token-optimizer-mcp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Token Optimizer MCP 用于衡量每个 AI 编程代理的 Token 节省情况、优化上下文，并在 16 个 CLI 客户端之间共享本地实时知识图谱。在 5.1.0 版本之前，token-optimizer-mcp 存在漏洞，其中 smart_user 工具容易受到操作系统命令注入攻击。任何能够调用 smart_user 工具的 MCP 客户端，都可以通过 get-user-info 操作的 username 参数执行任意 Shell 命令。这些命令将以运行 token-optimizer-mcp 服务
Possible ATT&CK Techniques 1 AI
T1059 · Command and Scripting InterpreterAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| ooples | token-optimizer-mcp | < 5.1.0 |
affected |
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I. Basic Information for CVE-2026-55157
Vulnerability Information
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Vulnerability Title
Token Optimizer MCP: OS command injection in smart_user via username in get-user-info
Source: CVE Program / CVE List V5
Vulnerability Description
Token Optimizer MCP measures token savings per AI coding agent, optimizes context, and shares a live local knowledge graph across 16 CLI clients. Prior to version 5.1.0, token-optimizer-mcp is vulnerable to OS command injection in the smart_user tool. Any MCP client that can call the smart_user tool can execute arbitrary shell commands through the username argument of the get-user-info operation. The commands execute with the privileges of the user running the token-optimizer-mcp server. This issue has been patched in version 5.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| ooples | token-optimizer-mcp | < 5.1.0 | - |
|
II. Public POCs for CVE-2026-55157
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-55157 (3)
-
https://github.com/ooples/token-optimizer-mcp/releases/tag/v5.1.0 x_refsource_MISC
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V. Comments for CVE-2026-55157
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