CVE-2026-117573

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.

References

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