Server-Side Request Forgery in python-utcp by Universal Tool Calling Protocol
CVE-2026-101060

8.4HIGH

Key Information:

Vendor

Universal-tool-calling-protocol

Status
Python-utcp
Vendor
CVE Published:
27 September 2026

What is CVE-2026-101060?

The python-utcp library prior to version 1.1.4 is susceptible to a server-side request forgery (SSRF) vulnerability. This issue arises in the HttpCommunicationProtocol.call_tool function, where the initial tool URL is validated, but subsequent HTTP redirects are not re-validated. An attacker can exploit this by controlling a tool endpoint, enabling them to issue a 302 redirect to internal services. This allows the UTCP client to access sensitive internal HTTP services or cloud metadata endpoints unexpectedly, potentially compromising them by retrieving their response bodies.

Affected Version(s)

python-utcp 0 < 1.1.4

python-utcp 1.1.4

References

https://github.com/universal-tool-calling-protocol/python...
vendor-advisory
https://www.vulncheck.com/advisories/python-utcp-before-1...
third-party-advisory

CVSS V4

Score:
8.4
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

lexdotdev
.