---
id: CVE-2026-117573
title: >-
  hagent through commit 761eec6 OS Command Injection via Arduino and ESP32 MCP
  Tools
summary: >-
  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…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-78
vendor: masc-ucsc
product: hagent
affected:
  - hagent <= 761eec627a1e6fb128a2a8ce9245aa595cc2f7af
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T13:08:03.276Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-117573'
references:
  - url: 'https://github.com/masc-ucsc/hagent/issues/98'
    label: 'GitHub Issue #98'
  - url: 'https://github.com/masc-ucsc/hagent'
  - url: >-
      https://github.com/masc-ucsc/hagent/blob/761eec627a1e6fb128a2a8ce9245aa595cc2f7af/hagent/mcp/mcp_arduino.py#L776
  - url: >-
      https://github.com/masc-ucsc/hagent/blob/761eec627a1e6fb128a2a8ce9245aa595cc2f7af/hagent/mcp/mcp_esp32.py#L682
  - url: >-
      https://www.vulncheck.com/advisories/hagent-through-commit-761eec6-os-command-injection-via-arduino-and-esp32-mcp-tools
    label: >-
      VulnCheck Advisory: hagent through commit 761eec6 OS Command Injection via
      Arduino and ESP32 MCP Tools
tags:
  - cve.org
ingestedAt: '2026-10-27T16:11:59.341Z'
---

## Overview

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.

## Affected

- `hagent <= 761eec627a1e6fb128a2a8ce9245aa595cc2f7af`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.