# CVE-2026-54155

## Summary

- **CVE ID:** CVE-2026-54155
- **Severity:** HIGH
- **CVSS Score:** 7.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L)
- **CWE:** CWE-347
- **Published:** Sep 14, 2026
- **Last Modified:** Sep 14, 2026

## 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.

## Affected Products

- node-opcua — node-opcua (< 2.166.0)

## References

- [CNA](https://github.com/node-opcua/node-opcua/security/advisories/GHSA-mq36-523m-x7vv)
- [CNA](https://github.com/node-opcua/node-opcua/commit/c6b05738682f5c8d70b1ea275c881f01a1cd9787)
- [CNA](https://github.com/node-opcua/node-opcua/releases/tag/v2.166.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.33%
- **EPSS Percentile:** 25.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._