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

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-05-28T20:38:16.780Z",
    "modified": "2026-05-28T20:38:16.780Z",
    "type": "cve",
    "title": "typescript-utcp: SSRF via attacker-controlled OpenAPI servers[0].url in HTTP communication protocol",
    "source": "GitHub_M",
    "references": "https://github.com/universal-tool-calling-protocol/typescript-utcp/security/advisories/GHSA-r8j5-8747-88cm",
    "id": "CVE-2026-45366",
    "bulletinFamily": "",
    "cwe": [
        "CWE-918"
    ],
    "cvelist": null,
    "sourceData": "universal-tool-calling-protocol typescript-utcp < 1.1.2",
    "sourceHref": "",
    "cvss": {
        "score": 4.7,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
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    "href": "",
    "category_name": "CVE",
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    "product": "typescript-utcp",
    "version": "< 1.1.2",
    "vendor": "universal-tool-calling-protocol",
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    "ai_score": 0
}