node-opcua: Missing nonce verification in UserNameIdentityToken authentication (CVE-2026-54155) | HOL Guard CVE

High severityCVE-2026-54155GHSA-MQ36-523M-X7VV

node-opcua: Missing nonce verification in UserNameIdentityToken authentication

Answer in brief

CVE-2026-54155 records a High severity vulnerability in node-opcua: Missing nonce verification in UserNameIdentityToken authentication. The current sources do not mark it as known exploited. The current feed maps node-opcua/node-opcua (generic), node-opcua (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 14, 2026Updated Sep 14, 2026Source checked Sep 14, 2026First seen by HOL Aug 20, 2026Material review Sep 14, 2026

Upstream Advisory

Key facts

Risk: High
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps node-opcua/node-opcua (generic), node-opcua (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
node-opcua/node-opcuageneric	< 2.166.0	Not reported
node-opcuanpm	<=2.165.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for node-opcua/node-opcua, node-opcua.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 20, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.