node-opcua up to 2.169.0 Keep Alive Manager ClientSessionKeepAliveManager._ping_server resource consumption

Summaryinfo

A vulnerability was found in node-opcua up to 2.169.0 and classified as critical. Affected by this vulnerability is the function ClientSessionKeepAliveManager._ping_server of the component Keep Alive Manager. The manipulation results in resource consumption. This vulnerability is reported as CVE-2026-68904. The attack can be launched remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in node-opcua up to 2.169.0. It has been classified as critical. Affected is the function ClientSessionKeepAliveManager._ping_server of the component Keep Alive Manager. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-68904 since 07/31/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 2.170.0 eliminates this vulnerability.

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Productinfo

Name

• node-opcua

Version

• 2.169

Website

• Product: https://github.com/node-opcua/node-opcua/

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