CVE-2026-54155

CVE-2026-54155 · node-opcua: Missing nonce verification in UserNameIdentityToken authentication

This page contains facts from public vulnerability sources. Check the original advisory before updating.

node-opcua is an OPC UA implementation for TypeScript and Node.js. Prior to 2.166.0, the UserNameIdentityToken authentication handler in packages/node-opcua-server/source/opcua_server.ts decrypts an RSA-OAEP password blob but does not verify that the trailing bytes match the current session serverNonce. An unauthenticated remote attacker can obtain the server public key through GetEndpoints and forge a blob whose little-endian length produces an empty password passed to isValidUser, compromising accounts that accept an empty password. Missing nonce binding also allows a captured UserNameIdentityToken ciphertext to be replayed in another session, and SecurityMode=None removes the separate client-signature safeguard. This issue is fixed in version 2.166.0.

CVSS 7.7 · High · EPSS 0.4%

Published

2026-09-14T16:07:50.461Z

Updated

2026-09-14T16:39:35.824Z

Stack: node

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