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Vulnerability record · CVE-2026-68904 · published 16 September 2026

CVE-2026-68904: Uncontrolled resource consumption vulnerability

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.

7.0 CVSS 3.1 High EPSS 0.44% · top 64.0% CWE-400 · Uncontrolled resource consumption Received
7.0CVSS 3.1 base score
0.44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
16 Sep 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

References

LinkTags
https://github.com/node-opcua/node-opcua/commit/1959cbb8946b386d2e24a1cce05b7148099d36e7
https://github.com/node-opcua/node-opcua/commit/481664fa6ba8204737c5a92797ff68c3ae780c1c
https://github.com/node-opcua/node-opcua/commit/4d59197e2dbd82791d7f36dad7da178715e0c27a
https://github.com/node-opcua/node-opcua/commit/dc406fd2d364aa69dd173be21ed32a7ff425017a
https://github.com/node-opcua/node-opcua/pull/1497
https://github.com/node-opcua/node-opcua/releases/tag/v2.170.0
https://github.com/node-opcua/node-opcua/security/advisories/GHSA-r2pf-9cw4-5j65

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Source: NIST National Vulnerability Database (record CVE-2026-68904), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.