---
id: CVE-2026-69200
title: node-opcua is an OPC UA implementation for TypeScript and Node.js
summary: >-
  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 unsanitiz…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-1321
vendor: node-opcua
product: node-opcua
affected:
  - node-opcua < 2.145.0
published: '2026-09-16'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T21:19:05.340'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-69200'
references:
  - url: >-
      https://github.com/node-opcua/node-opcua/security/advisories/GHSA-cv5q-7543-48q4
    label: security-advisories@github.com
  - url: >-
      https://github.com/node-opcua/node-opcua/security/advisories/GHSA-cv5q-7543-48q4
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00346
epssPercentile: 0.25366
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-18T18:10:04.882409Z'
ingestedAt: '2026-09-16T16:59:56.611Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.