---
id: CVE-2026-68904
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. From 2.0.0
  until 2.170.0, node-opcua clients using the default keepSessionAlive setting
  can enter a repeated reconnection cycle when an OPC UA server's clock skew
  causes …
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H'
cwe:
  - CWE-400
vendor: node-opcua-transport
product: node-opcua-transport
affected:
  - 'node-opcua-transport >= 2.0.0, < 2.170.0'
  - 'node-opcua-client >= 2.0.0, < 2.170.0'
  - 'node-opcua >= 2.0.0, < 2.170.0'
patched:
  - node-opcua-transport 2.170.0
  - node-opcua-client 2.170.0
  - node-opcua 2.170.0
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:17:25.403'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-68904'
references:
  - url: >-
      https://github.com/node-opcua/node-opcua/commit/1959cbb8946b386d2e24a1cce05b7148099d36e7
    label: security-advisories@github.com
  - url: >-
      https://github.com/node-opcua/node-opcua/commit/481664fa6ba8204737c5a92797ff68c3ae780c1c
    label: security-advisories@github.com
  - url: >-
      https://github.com/node-opcua/node-opcua/commit/4d59197e2dbd82791d7f36dad7da178715e0c27a
    label: security-advisories@github.com
  - url: >-
      https://github.com/node-opcua/node-opcua/commit/dc406fd2d364aa69dd173be21ed32a7ff425017a
    label: security-advisories@github.com
  - url: 'https://github.com/node-opcua/node-opcua/pull/1497'
    label: security-advisories@github.com
  - url: 'https://github.com/node-opcua/node-opcua/releases/tag/v2.170.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/node-opcua/node-opcua/security/advisories/GHSA-r2pf-9cw4-5j65
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-r2pf-9cw4-5j65'
tags:
  - nvd
  - ghsa
  - npm
  - cve.org
aliases:
  - GHSA-r2pf-9cw4-5j65
ecosystem: npm
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-16T18:18:49.358461Z'
ingestedAt: '2026-09-16T16:59:56.548Z'
epss: 0.00443
epssPercentile: 0.35894
---

## Overview

node-opcua is an OPC UA implementation for TypeScript and Node.js. From 2.0.0 until 2.170.0, node-opcua clients using the default keepSessionAlive setting can enter a repeated reconnection cycle when an OPC UA server's clock skew causes BadInvalidTimestamp responses. ClientSessionKeepAliveManager._ping_server treated the server-originated ServiceFault as a network outage and forced a transport reconnect, while ClientTCP_transport._on_ACK_response used socket.end() after failed HEL/ACK negotiation and could leave the connection in FIN-WAIT-2 when the peer did not close. Repetition at the keepAliveInterval accumulates file descriptors and memory until the client process or container can be terminated by resource exhaustion. This issue is fixed in version 2.170.0.

## Remediation

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

## Package advisory (CVE-2026-68904)

Affected packages:

- `node-opcua-transport >= 2.0.0, < 2.170.0`
- `node-opcua-client >= 2.0.0, < 2.170.0`
- `node-opcua >= 2.0.0, < 2.170.0`

Patched in:

- `node-opcua-transport 2.170.0`
- `node-opcua-client 2.170.0`
- `node-opcua 2.170.0`

Source: https://github.com/advisories/GHSA-r2pf-9cw4-5j65