---
id: CVE-2025-14542
aliases:
  - GHSA-75mj-4g74-9rg2
  - PYSEC-2026-2000
title: >-
  Universal Tool Calling Protocol (UTCP) client library for Python vulnerable to
  Trust Boundary Violation through Manual JSON specification
summary: >-
  Universal Tool Calling Protocol (UTCP) client library for Python vulnerable to
  Trust Boundary Violation through Manual JSON specification
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'
vendor: utcp
product: utcp
ecosystem: pip
affected:
  - utcp < 1.1.0
patched:
  - utcp 1.1.0
published: '2025-12-13'
updated: '2026-07-07'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-75mj-4g74-9rg2'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-14542'
  - url: >-
      https://github.com/universal-tool-calling-protocol/python-utcp/commit/2dc9c02df72cad3770c934959325ec344b441444
  - url: 'https://github.com/universal-tool-calling-protocol/python-utcp'
  - url: >-
      https://research.jfrog.com/vulnerabilities/python-utcp-untrusted-manual-command-execution-jfsa-2025-001648329
tags:
  - osv
  - pip
epss: 0.00264
epssPercentile: 0.16295
ingestedAt: '2026-07-08T18:25:46.776Z'
---

## Overview

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 packages

- `utcp < 1.1.0`

## Remediation

Upgrade to a patched release:

- `utcp 1.1.0`