CVE-2026-69200
node-opcua: Prototype Pollution via internal `fieldsToJson()` implementation (Related to CVE-2024-57086)
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-1321 |
| Vendor | node-opcua |
| Product | node-opcua |
| Published | Sep 16, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
node-opcua / node-opcua
< 2.145.0