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Vulnerability record · CVE-2026-54155 · published 14 September 2026

CVE-2026-54155: Improper verification of cryptographic signature vulnerability

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.

7.7 CVSS 3.1 High EPSS 0.42% · top 65.8% CWE-347 · Improper verification of cryptographic signature Received
7.7CVSS 3.1 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
14 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

References

LinkTags
https://github.com/node-opcua/node-opcua/commit/c6b05738682f5c8d70b1ea275c881f01a1cd9787
https://github.com/node-opcua/node-opcua/releases/tag/v2.166.0
https://github.com/node-opcua/node-opcua/security/advisories/GHSA-mq36-523m-x7vv

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Source: NIST National Vulnerability Database (record CVE-2026-54155), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.