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CVE-2026-44661— python-utcp: SSRF via attacker-controlled OpenAPI servers[0].url in HTTP communication protocol

Quick assessment

Affected
universal-tool-calling-protocol python-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 1.1.3之前版本存在代码问题漏洞，该漏洞源于信任边界不一致，可能导致盲服务器端请求伪造攻击。

CVSS 4.7 · Medium EPSS 0.20% · P8

Affected Version Matrix 1

VendorProduct Version RangeStatus
universal-tool-calling-protocol python-utcp < 1.1.2 affected
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I. Basic Information for CVE-2026-44661

Vulnerability Information
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Vulnerability Title
python-utcp: SSRF via attacker-controlled OpenAPI servers[0].url in HTTP communication protocol
Source: CVE Program / CVE List V5
Vulnerability Description
python-utcp is the python implementation of UTCP. Prior to 1.1.3, the utcp-http plugin is vulnerable to a blind Server-Side Request Forgery (SSRF) caused by a trust-boundary inconsistency between manual discovery and tool invocation. register_manual() validates the discovery URL against an HTTPS / loopback allowlist, but call_tool() and call_tool_streaming() reuse the resolved tool_call_template.url directly without revalidating, and the OpenAPI converter 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 OpenAPI converter then produces tools whose URL points at internal services on the agent host. All three HTTP-class protocols (utcp_http.http, utcp_http.streamable_http, utcp_http.sse) shared the same gap. This vulnerability is fixed in 1.1.3.
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 1.1.3之前版本存在代码问题漏洞，该漏洞源于信任边界不一致，可能导致盲服务器端请求伪造攻击。
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 python-utcp < 1.1.2 -

II. Public POCs for CVE-2026-44661

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III. Intelligence Information for CVE-2026-44661

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Vendor Advisories for CVE-2026-44661 (1)

Same Patch Batch · universal-tool-calling-protocol · 2026-05-14 · 3 CVEs total

CVE-2026-45369 8.3 HIGH python-utcp: Command Injection via Unsanitized Argument Substitution in CLI Communication
CVE-2026-45370 7.7 HIGH python-utcp: Full Process Environment Exposed to CLI Subprocess - Secrets Leakage via Comm

IV. Related Vulnerabilities

Same product: python-utcp
Same vendor: universal-tool-calling-protocol
Same weakness: CWE-918

V. Comments for CVE-2026-44661

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