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CVE-2026-69200

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

CVSS 3.1 3.7 LOWCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-69200

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-69200

Published

node-opcua

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "node-opcua",
                    "product": "node-opcua",
                    "versions": [
                        {
                            "version": "< 2.145.0",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON