{"id":"CVE-2026-54155","title":"node-opcua is an OPC UA implementation for TypeScript and Node.js","summary":"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 ve…","severity":"high","cvss":7.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","cwe":["CWE-347"],"vendor":"node-opcua","product":"node-opcua","affected":["node-opcua < 2.166.0"],"published":"2026-09-14","updated":"2026-09-14","sourceUpdated":"2026-09-14T17:17:46.737","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-54155","references":[{"url":"https://github.com/node-opcua/node-opcua/commit/c6b05738682f5c8d70b1ea275c881f01a1cd9787","label":"security-advisories@github.com"},{"url":"https://github.com/node-opcua/node-opcua/releases/tag/v2.166.0","label":"security-advisories@github.com"},{"url":"https://github.com/node-opcua/node-opcua/security/advisories/GHSA-mq36-523m-x7vv","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-mq36-523m-x7vv"}],"tags":["nvd","cve.org","ghsa","npm"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-14T16:39:00.556555Z"},"aliases":["GHSA-mq36-523m-x7vv"],"ecosystem":"npm","ingestedAt":"2026-08-20T18:59:55.189Z","epss":0.00327,"epssPercentile":0.2605,"slug":"CVE-2026-54155","body":"## Overview\n\nnode-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-54155)\n\nAffected packages:\n\n- `node-opcua <= 2.165.0`\n\nSource: https://github.com/advisories/GHSA-mq36-523m-x7vv","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":42.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}