utcp-gql before 1.1.1 and utcp-websocket before 1.1.1 contain server-side request forgery vulnerabilities due to incomplete application of CVE-2026-44661 fixes. The GraphQL plugin uses a vulnerable prefix check allowing bypass URLs like http://127.0.0.1.attacker.example, while the WebSocket plugin performs no URL validation despite documented security requirements. Attackers can force connections to internal services and cloud metadata endpoints by supplying malicious tool URLs in call templates, and receive configured API keys and OAuth tokens sent to attacker-controlled hosts.
Weakness
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
Related Attack Patterns
References
- https://github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-ppx3-28rw-8fpf
- https://www.vulncheck.com/advisories/utcp-gql-and-utcp-websocket-before-1.1.1-ssrf-via-url-validation-bypass
- https://github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-ppx3-28rw-8fpf