CVE-2026-45369
python-utcp: Command Injection via Unsanitized Argument Substitution in CLI Communication Protocol
CVSS Score
8.3
EPSS Score
0.0%
EPSS Percentile
0th
python-utcp is the python implementation of UTCP. Prior to 1.1.3, 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. This vulnerability is fixed in 1.1.3.
| CWE | CWE-78 |
| Vendor | universal-tool-calling-protocol |
| Product | python-utcp |
| Published | May 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
universal-tool-calling-protocol / python-utcp
< 1.1.2