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CVE-2025-1243— Field in api-go proxy not transformed before version 1.44.1

Quick assessment

Affected
Temporal Technologies, Inc. api-go library
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.

api-go是temporal开源的一个接口程序。 api-go 1.44.1之前版本存在安全漏洞，该漏洞源于使用代理时未将update response信息发送至Data Converter。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.09% · P1

Possible ATT&CK Techniques 1 AI

T1042
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I. Basic Information for CVE-2025-1243

Vulnerability Information
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Vulnerability Title
Field in api-go proxy not transformed before version 1.44.1
Source: CVE Program / CVE List V5
Vulnerability Description
The Temporal api-go library prior to version 1.44.1 did not send `update response` information to Data Converter when the proxy package within the api-go module was used in a gRPC proxy prior to transmission. This resulted in information contained within the `update response` field not having Data Converter transformations (e.g. encryption) applied. This is an issue only when using the UpdateWorkflowExecution APIs (released on 13th January 2025) with a proxy leveraging the api-go library before version 1.44.1. Other data fields were correctly sent to Data Converter. This issue does not impact the Data Converter server. Data was encrypted in transit. Temporal Cloud services are not impacted.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据加密缺失
Source: CVE Program / CVE List V5
Vulnerability Title
api-go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
api-go是temporal开源的一个接口程序。 api-go 1.44.1之前版本存在安全漏洞，该漏洞源于使用代理时未将update response信息发送至Data Converter。
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
Temporal Technologies, Inc. api-go library 0 ~ 1.44.1 -

II. Public POCs for CVE-2025-1243

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III. Intelligence Information for CVE-2025-1243

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Security Blog Posts for CVE-2025-1243 (1)

Vendor Pages for CVE-2025-1243 (1)

IV. Related Vulnerabilities

Same vendor: Temporal Technologies, Inc.
Same weakness: CWE-311

V. Comments for CVE-2025-1243

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