High severity8.3GHSA Advisory· Published May 14, 2026· Updated May 16, 2026

CVE-2026-45369

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.

Affected products

Universal Tool Calling Protocol/Python UtcpGHSA
Range: <= 1.1.1

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

github.com/advisories/GHSA-33p6-5jxp-p3x4ghsaADVISORY
github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-33p6-5jxp-p3x4nvd
nvd.nist.gov/vuln/detail/CVE-2026-45369ghsa

News mentions

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