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3 vulnerabilities by universal-tool-calling-protocol

CVE-2026-45369 (GCVE-0-2026-45369)

Vulnerability from cvelistv5 – Published: 2026-05-14 20:14 – Updated: 2026-05-16 01:00
VLAI
Title
python-utcp: Command Injection via Unsanitized Argument Substitution in CLI Communication Protocol
Summary
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.
Severity
8.3 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
CWE
  • CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-45370 (GCVE-0-2026-45370)

Vulnerability from cvelistv5 – Published: 2026-05-14 20:14 – Updated: 2026-05-15 11:23
VLAI
Title
python-utcp: Full Process Environment Exposed to CLI Subprocess - Secrets Leakage via Command Injection
Summary
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.
Severity
7.7 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
CWE
  • CWE-526 - Cleartext Storage of Sensitive Information in an Environment Variable
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-44661 (GCVE-0-2026-44661)

Vulnerability from cvelistv5 – Published: 2026-05-14 20:12 – Updated: 2026-05-15 11:25
VLAI
Title
python-utcp: SSRF via attacker-controlled OpenAPI servers[0].url in HTTP communication protocol
Summary
python-utcp is the python implementation of UTCP. Prior to 1.1.3, the utcp-http plugin is vulnerable to a blind Server-Side Request Forgery (SSRF) caused by a trust-boundary inconsistency between manual discovery and tool invocation. register_manual() validates the discovery URL against an HTTPS / loopback allowlist, but call_tool() and call_tool_streaming() reuse the resolved tool_call_template.url directly without revalidating, and the OpenAPI converter blindly trusts whatever servers[0].url an attacker-hosted spec declares. An attacker who hosts a malicious OpenAPI spec on a legitimate HTTPS endpoint can declare e.g. servers: [{ url: "http://127.0.0.1:9090" }] or servers: [{ url: "http://169.254.169.254" }]; the OpenAPI converter then produces tools whose URL points at internal services on the agent host. All three HTTP-class protocols (utcp_http.http, utcp_http.streamable_http, utcp_http.sse) shared the same gap. This vulnerability is fixed in 1.1.3.
Severity
4.7 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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