CVE-2026-45370: Universal-Tool-Calling-Protocol Python-Utcp

High severity, CVSS 7.7. EPSS: 0.4% chance of exploitation in the next 30 days.

python-utcp is the python implementation of UTCP. Prior to 1.1.3, _prepare_environment() in cli_communication_protocol.py passes a full copy of os.environ to every CLI subprocess. When combined with CVE-2026-45369, an attacker can exfiltrate all process-level secrets in a single tool call. This vulnerability is fixed in 1.1.3.

Affected products

• Universal-Tool-Calling-Protocol Python-Utcp: before 1.1.2 (fixed in 1.1.2)

Published 2026-05-14. Last modified 2026-06-17.