CVE-2026-45369

python-utcp: Command Injection via Unsanitized Argument Substitution in CLI Communication Protocol

Published May 14, 2026 CVSS 3.1 · 8.3 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-33p6-5jxp-p3x4 utcp-cli Vulnerable to Command Injection via Unsanitized Argument Substitution in CLI Communication Protocol
History
Type Values Removed Values Added
First Time appeared Universal-tool-calling-protocol
Universal-tool-calling-protocol python-utcp
Vendors & Products Universal-tool-calling-protocol
Universal-tool-calling-protocol python-utcp
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title python-utcp: Command Injection via Unsanitized Argument Substitution in CLI Communication Protocol
Weaknesses CWE-78
References
Metrics cvssV3_1

{'score': 8.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
May 16, 2026, 1:00 AM
Reserved
May 12, 2026, 12:51 AM
Status
Deferred
Published
May 14, 2026, 9:16 PM
Modified
Oct 26, 2026, 2:10 PM