CVE-2026-101059: Universal-Tool-Calling-Protocol Python-Utcp

High severity, CVSS 7.1. EPSS: 0.2% chance of exploitation in the next 30 days.

utcp-http before 1.1.4 fails to validate the OAuth2 tokenUrl field from remote OpenAPI specifications, allowing attackers to redirect credential submission to arbitrary endpoints. When a victim registers an attacker-controlled OpenAPI spec and invokes a generated OAuth2-protected tool, the library POSTs the victim's client_id and client_secret to the attacker-supplied token endpoint without URL validation.

Affected products

• Universal-Tool-Calling-Protocol Python-Utcp: before 1.1.4 (fixed in 1.1.4)

Published 2026-09-27. Last modified 2026-09-30.