CVE-2026-45366

Description

@utcp/http: SSRF via attacker-controlled OpenAPI servers[0].url in HTTP communication protocol

Description (MITRE) cveawg.mitre.org

Pulled from cveawg.mitre.org/api/cve/CVE-2026-45366 on 2026-07-07. Shown when MITRE's text differs from the cvelistV5 mirror.

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.

Overview

State

—

Assigner (CNA)

—

CVSS severity

medium

CVSS score

4.7 / 10

CVSS vector

AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

Effective score

4.7 / 10 MEDIUM source: CNA overview

CWE(s)

—

Reserved

—

Published

—

Last updated

—

Source

https://www.tenable.com/cve/CVE-2026-45366

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID

EUVD-2026-33053

Assigner

GitHub_M

Published

May 28, 2026, 8:38:16 PM

Updated

May 29, 2026, 1:56:10 PM

EUVD base score (CVSS 3.1)

4.7 / 10
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

EUVD-reported EPSS

0.1200

Vendors

universal-tool-calling-protocol

Products

typescript-utcp (< 1.1.2)

Aliases

GHSA-r8j5-8747-88cm

ENISA 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.

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

Web references (4)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

• https://github.com/universal-tool-calling-protocol/typescript-utcp/security/advisories/GHSA-r8j5-8747-88cm tenable:github.com
• https://www.first.org/epss/ tenable:www.first.org
• https://nvd.nist.gov/vuln/detail/CVE-2026-45366 tenable:nvd.nist.gov
• https://www.cve.org/CVERecord?id=CVE-2026-45366 tenable:www.cve.org

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