CVE-2026-45369: utcp-cli Vulnerable to Command Injection via Unsanitized Argument Substitution in CLI Communication Protocol

May 14, 2026 (updated May 15, 2026)

The _substitute_utcp_args method in cli_communication_protocol.py inserts user-controlled tool_args values directly into shell command strings without any sanitization or escaping. These commands are then executed via /bin/bash -c (Unix) or powershell.exe -Command (Windows), allowing an attacker to inject arbitrary shell commands.

References

github.com/advisories/GHSA-33p6-5jxp-p3x4
github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-33p6-5jxp-p3x4
nvd.nist.gov/vuln/detail/CVE-2026-45369

Code Behaviors & Features

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