CVE-2026-101058 (GCVE-0-2026-101058)

Vulnerability from cvelistv5 – Published: 2026-09-27 17:02 – Updated: 2026-09-27 17:02
VLAI
Title
python-utcp before 1.1.12 SSRF via Remote HTTP Manual
Summary
python-utcp (pip package utcp-http) before 1.1.12 does not verify whether tool URLs declared in a hand-written UTCP manual point at the agent's own loopback interface when that manual is discovered from a remote, non-loopback origin. Because ensure_secure_url intentionally permits loopback HTTP for local development and native manuals bypassed the loopback check performed by the OpenAPI converter, an attacker who can serve a UTCP manual that a victim registers can cause the client to issue requests to services bound only to 127.0.0.1 on the victim host and have the response bodies returned to the caller (server-side request forgery). The http, sse and streamable_http protocols are all affected. Reach is limited to loopback, and exploitation further requires a loopback service that answers unauthenticated requests with useful data. Fixed in utcp-http 1.1.12, which rejects manuals fetched from a non-loopback origin that declare loopback tool URLs, keyed off the final post-redirect discovery URL.
Severity
7.1 (High)
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N
6.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
Impacted products
Vendor Product Version CPE status
universal-tool-calling-protocol python-utcp Affected: 0 , < 1.1.12 (semver)
Unaffected: 1.1.12 (semver)
guessed Create a notification for this product.
Date Public
2026-09-05 00:00
Credits
EQSTLab 232-323
Show details on NVD website
To clipboard 

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