CVE-2026-45366

CVE-2026-45366 · typescript-utcp: SSRF via attacker-controlled OpenAPI servers[0].url in HTTP communication protocol

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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.

CVSS 4.7 · Moyenne · EPSS 0,1% · Correctif disponible

Publication

2026-05-28T20:38:16.780Z

Mise à jour

2026-05-29T13:56:10.659Z

Pile logicielle: node

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