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CVE-2026-45370— python-utcp: Full Process Environment Exposed to CLI Subprocess - Secrets Leakage via Command Injection

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之前版本存在安全漏洞，该漏洞源于_prepare_environment方法传递完整环境变量给子进程，可能导致秘密泄露。

CVSS 7.7 · High EPSS 0.37% · P29

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-2026-45370

Vulnerability Information
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Vulnerability Title
python-utcp: Full Process Environment Exposed to CLI Subprocess - Secrets Leakage via Command Injection
Source: CVE Program / CVE List V5
Vulnerability Description
python-utcp is the python implementation of UTCP. Prior to 1.1.3, _prepare_environment() in cli_communication_protocol.py passes a full copy of os.environ to every CLI subprocess. When combined with CVE-2026-45369, an attacker can exfiltrate all process-level secrets in a single tool call. This vulnerability is fixed in 1.1.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过环境变量导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Universal Tool Calling Protocol 安全漏洞
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之前版本存在安全漏洞，该漏洞源于_prepare_environment方法传递完整环境变量给子进程，可能导致秘密泄露。
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-2026-45370

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III. Intelligence Information for CVE-2026-45370

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Vendor Advisories for CVE-2026-45370 (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-2026-44661 4.7 MEDIUM python-utcp: SSRF via attacker-controlled OpenAPI servers[0].url in HTTP communication pro

IV. Related Vulnerabilities

Same product: python-utcp
Same vendor: universal-tool-calling-protocol
Same weakness: CWE-526

V. Comments for CVE-2026-45370

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