CVE-2026-45370

In the python-utcp library prior to version 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. This allows an attacker to inject arbitrary shell commands.

python-utcp before version 1.1.4 contains a server-side request forgery (SSRF) vulnerability in HttpCommunicationProtocol.call_tool that validates the initial tool URL but follows HTTP redirects without re-validating the target. Attackers controlling a tool endpoint can return a 302 redirect to internal services, allowing the UTCP client to reach cloud metadata endpoints or internal HTTP services and return their response bodies to the caller.

python-utcp (pip package utcp-http) before 1.1.12 does not verify whether tool URLs declared in a hand-written UTCP manual point at the agent's own loopback interface when that manual is discovered from a remote, non-loopback origin. An attacker can serve a manual that a victim registers, causing the client to issue requests to services bound only to 127.0.0.1 on the victim host and have the response bodies returned to the caller (server-side request forgery).

A vulnerability was detected in universal-tool-calling-protocol python-utcp version 1.1.0 in the utcp-gql/utcp-websocket component. Manipulation leads to server-side request forgery (SSRF). The attack can be initiated remotely. The exploit is public. The vendor did not respond.