CVE-2026-117573— hagent through commit 761eec6 OS Command Injection via Arduino and ESP32 MCP Tools

Quick assessment

Affected

masc-ucsc hagent

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.

截至提交 761eec6，hagent 存在操作系统命令注入漏洞。该漏洞允许 MCP 客户端通过向和工具的参数注入元字符，从而执行 shell 命令。攻击者或受提示注入（prompt injection）影响的代理可构造恶意参数，将其插值到使用执行的和命令中，进而以 MCP 服务器用户的身份执行任意命令。

CVSS 7.8 · High Updated Oct 27, 2026

Possible ATT&CK Techniques 3 AI

T1190 · Exploit Public-Facing Application T1059.004 · Unix Shell T1203 · Exploitation for Client Execution

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Vulnerability Information

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Vulnerability Title

hagent through commit 761eec6 OS Command Injection via Arduino and ESP32 MCP Tools

Source: CVE Program / CVE List V5

Vulnerability Description

hagent through commit 761eec6 contains an OS command injection vulnerability that allows MCP clients to execute shell commands by injecting metacharacters into the args parameter of the hagent_arduino and hagent_esp32 tools. Attackers or prompt-injected agents can supply crafted args interpolated into arduino-cli and idf.py commands run with subprocess.run(shell=True) to execute commands as the MCP server user.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:L/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
masc-ucsc	hagent	0 ~ 761eec627a1e6fb128a2a8ce9245aa595cc2f7af	-

II. Public POCs for CVE-2026-117573

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-117573

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Other References for CVE-2026-117573 (5)

https://github.com/masc-ucsc/hagent/blob/761eec627a1e6fb128a2a8ce9245aa595cc2f7af/hagent/mcp/mcp_esp32.py#L682 technical-description
https://github.com/masc-ucsc/hagent product
https://github.com/masc-ucsc/hagent/blob/761eec627a1e6fb128a2a8ce9245aa595cc2f7af/hagent/mcp/mcp_arduino.py#L776 technical-description
https://github.com/masc-ucsc/hagent/issues/98 issue-tracking
https://www.vulncheck.com/advisories/hagent-through-commit-761eec6-os-command-injection-via-arduino-and-esp32-mcp-tools third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-117573

IV. Related Vulnerabilities

Same weakness: CWE-78