CVE-2026-45366 (GCVE-0-2026-45366)

Vulnerability from cvelistv5 – Published: 2026-05-28 20:38 – Updated: 2026-05-29 13:56
VLAI?
Title
typescript-utcp: SSRF via attacker-controlled OpenAPI servers[0].url in HTTP communication protocol
Summary
typescript-utcp is a typescript implementation of UTCP. Prior to 1.1.2, the @utcp/http package is vulnerable to a blind Server-Side Request Forgery (SSRF) caused by a trust-boundary inconsistency between manual discovery and tool invocation. registerManual() validates the discovery URL against an HTTPS / loopback allowlist, but callTool() reuses the resolved toolCallTemplate.url directly without revalidating, and the OpenApiConverter blindly trusts whatever servers[0].url an attacker-hosted spec declares. An attacker who hosts a malicious OpenAPI spec on a legitimate HTTPS endpoint can declare e.g. servers: [{ url: "http://127.0.0.1:9090" }] or servers: [{ url: "http://169.254.169.254" }]; the converter then produces tools whose URL points at internal services on the agent host. This vulnerability is fixed in 1.1.2.
Severity ?
4.7 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
Impacted products
Vendor Product Version
universal-tool-calling-protocol typescript-utcp Affected: < 1.1.2
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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