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CVE-2026-69200— node-opcua: Prototype Pollution via internal `fieldsToJson()` implementation (Related to CVE-2024-57086)

Quick assessment

Affected
node-opcua node-opcua
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.

node-opcua 是面向 TypeScript 和 Node.js 的 OPC UA 实现。在 node-opcua-client 2.145.0 之前的版本中，位于 文件中的内部方法 直接分配了未经净化的字段名，并允许通过 路径修改 。成功利用此漏洞需要应用程序向 暴露由攻击者控制的事件字段，可能导致拒绝服务（DoS）或应用程序逻辑损坏。该漏洞已在 2.145.0 版本中修复。

CVSS 3.7 · Low
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I. Basic Information for CVE-2026-69200

Vulnerability Information
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Vulnerability Title
node-opcua: Prototype Pollution via internal `fieldsToJson()` implementation (Related to CVE-2024-57086)
Source: CVE Program / CVE List V5
Vulnerability Description
node-opcua is an OPC UA implementation for TypeScript and Node.js. Prior to node-opcua-client 2.145.0, the internal fieldsToJson method in packages/node-opcua-client/source/alarms_and_conditions/client_alarm.ts directly assigns unsanitized field names and allows a __proto__.pollutedKey path to modify Object.prototype. Successful exploitation requires an application to expose attacker-controlled event fields to fieldsToJson and may cause denial of service or application logic corruption. This vulnerability is fixed in 2.145.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
node-opcua node-opcua < 2.145.0 -

II. Public POCs for CVE-2026-69200

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III. Intelligence Information for CVE-2026-69200

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Other References for CVE-2026-69200 (1)

IV. Related Vulnerabilities

Same product: node-opcua
Same vendor: node-opcua
Same weakness: CWE-1321

V. Comments for CVE-2026-69200

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