CVE-2026-45370: python-utcp: Full Process Environment Exposed to CLI Subprocess - Secrets Leakage via Command Injection

May 14, 2026 (updated May 15, 2026)

_prepare_environment() in cli_communication_protocol.py passes a full copy of os.environ to every CLI subprocess. When combined with the Command Injection vulnerability (CWE-78) in _substitute_utcp_args() tracked as GHSA-33p6-5jxp-p3x4, an attacker can exfiltrate all process-level secrets in a single tool call.

References

github.com/advisories/GHSA-5v57-8rxj-3p2r
github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-5v57-8rxj-3p2r
nvd.nist.gov/vuln/detail/CVE-2026-45370

Code Behaviors & Features

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