Vulnerability · Published Sep 16, 2026 · Assigned by GitHub_M

CVE-2026-68904node-opcua: TCP Socket Leak (FIN-WAIT-2) via keepalive reconnection cycle - Resource Exhaustion

High 7.0

In plain English

A high-severity uncontrolled resource consumption in node-opcua from node-opcua. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.0High

Exploit odds (30 days)0.4%top 61.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	node-opcua	2.170.0	GHSA-r2pf-9cw4-5j65
npm	node-opcua-client	2.170.0	GHSA-r2pf-9cw4-5j65
npm	node-opcua-transport	2.170.0	GHSA-r2pf-9cw4-5j65

Affected products (as reported)

Vendor	Product	Versions
node-opcua	node-opcua	>= 2.0.0, < 2.170.0

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H

References

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