CVE-2026-45369 HIGH

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

Vendor Universal-Tool-Calling-Protocol

Product python-utcp

Weakness CWE-78

Published May 14, 2026

Last update May 16, 2026

View on NVD All CVEs

CVSS base score

8.3/10

Attack vector Network

Attack complexity High

Privileges required None

User interaction Required

Confidentiality High

Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 14, 2026 CVE published

May 16, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-45369 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/78.html AskarLabs — CWE-78 write-up OS Command Injection

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