SSRF in Universal-Tool-Calling-Protocol Python-Utcp
CVE-2026-101061
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA… (vendor-advisory)
- www.vulncheck.com/advisories/utcp-gql-and-utcp-websocket-before-1.1.1-ssrf-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-101061?
- CVE-2026-101061 is a medium-severity vulnerability in Universal-Tool-Calling-Protocol Python-Utcp, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.7/10. Published 2026-09-27.
- How severe is CVE-2026-101061?
- Medium severity. CVSS v3 base score is 4.7 out of 10.