Universal Tool Calling Protocol (UTCP) client library for Python vulnerable to Trust Boundary Violation through Manual JSON specification
The vulnerability arises when a client fetches a tools’ JSON specification, known as a Manual, from a remote Manual Endpoint. While a provider may initially serve a benign manual (e.g., one defining an HTTP tool call), earning the clients’ trust, a malicious provider can later change the manual to exploit the client.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | utcp | < 1.1.0 | 1.1.0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-14542
- https://github.com/universal-tool-calling-protocol/python-utcp/commit/2dc9c02df72cad3770c934959325ec344b441444
- https://github.com/universal-tool-calling-protocol/python-utcp
- https://research.jfrog.com/vulnerabilities/python-utcp-untrusted-manual-command-execution-jfsa-2025-001648329
- https://pypi.org/project/utcp
- https://github.com/advisories/GHSA-75mj-4g74-9rg2
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-501- Platform
- Python (PyPI)
- Package
utcp- Disclosed
- 13.12.2025
- Updated
- 11.10.2026 13:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-2000 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-75mj-4g74-9rg2 - CC BY 4.0
Vulnerability history: utcp
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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