Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
universal-tool-calling-protocol typescript-utcp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Universal Tool Calling Protocol是Universal Tool Calling Protocol开源的一个UTCP的官方python实现库。 Universal Tool Calling Protocol 1.1.2之前版本存在代码问题漏洞，该漏洞源于@utcp/http包存在盲SSRF，registerManual()验证发现URL但callTool()重用已解析的toolCallTemplate.url而未重新验证，OpenApiConverter盲目信任攻击者托管规范中

CVSS 4.7 · Medium EPSS 0.20% · P8

Possible ATT&CK Techniques 1 AI

T1598.002 · Spearphishing Attachment

Affected Version Matrix 1

VendorProduct Version RangeStatus
universal-tool-calling-protocol typescript-utcp < 1.1.2 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-45366

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
typescript-utcp: SSRF via attacker-controlled OpenAPI servers[0].url in HTTP communication protocol
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Universal Tool Calling Protocol 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Universal Tool Calling Protocol是Universal Tool Calling Protocol开源的一个UTCP的官方python实现库。 Universal Tool Calling Protocol 1.1.2之前版本存在代码问题漏洞，该漏洞源于@utcp/http包存在盲SSRF，registerManual()验证发现URL但callTool()重用已解析的toolCallTemplate.url而未重新验证，OpenApiConverter盲目信任攻击者托管规范中
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
universal-tool-calling-protocol typescript-utcp < 1.1.2 -

II. Public POCs for CVE-2026-45366

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-45366

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-45366 (1)

IV. Related Vulnerabilities

Same vendor: universal-tool-calling-protocol
Same weakness: CWE-918

V. Comments for CVE-2026-45366

No comments yet

Leave a comment