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CVE-2026-45369— python-utcp: Command Injection via Unsanitized Argument Substitution in CLI Communication Protocol

Quick assessment

Affected
universal-tool-calling-protocol python-utcp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Universal Tool Calling Protocol是Universal Tool Calling Protocol开源的一个UTCP的官方python实现库。 Universal Tool Calling Protocol 1.1.3之前版本存在操作系统命令注入漏洞，该漏洞源于_substitute_utcp_args方法未清理用户控制的tool_args值，可能导致命令注入。

CVSS 8.3 · High EPSS 0.35% · P27

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
universal-tool-calling-protocol python-utcp < 1.1.2 affected
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I. Basic Information for CVE-2026-45369

Vulnerability Information
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Vulnerability Title
python-utcp: Command Injection via Unsanitized Argument Substitution in CLI Communication Protocol
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Universal Tool Calling Protocol 操作系统命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Universal Tool Calling Protocol是Universal Tool Calling Protocol开源的一个UTCP的官方python实现库。 Universal Tool Calling Protocol 1.1.3之前版本存在操作系统命令注入漏洞，该漏洞源于_substitute_utcp_args方法未清理用户控制的tool_args值，可能导致命令注入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
universal-tool-calling-protocol python-utcp < 1.1.2 -

II. Public POCs for CVE-2026-45369

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III. Intelligence Information for CVE-2026-45369

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Vendor Advisories for CVE-2026-45369 (1)

Same Patch Batch · universal-tool-calling-protocol · 2026-05-14 · 3 CVEs total

CVE-2026-45370 7.7 HIGH python-utcp: Full Process Environment Exposed to CLI Subprocess - Secrets Leakage via Comm
CVE-2026-44661 4.7 MEDIUM python-utcp: SSRF via attacker-controlled OpenAPI servers[0].url in HTTP communication pro

IV. Related Vulnerabilities

Same product: python-utcp
Same vendor: universal-tool-calling-protocol
Same weakness: CWE-78

V. Comments for CVE-2026-45369

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