{"id":"CVE-2026-54155","sourceIdentifier":"security-advisories@github.com","published":"2026-09-14T17:17:46.737","lastModified":"2026-09-30T19:38:27.293","vulnStatus":"Awaiting Analysis","cveTags":[],"descriptions":[{"lang":"en","value":"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":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"node-opcua","product":"node-opcua","versions":[{"version":"< 2.166.0","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","baseScore":7.7,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"LOW"},"exploitabilityScore":2.2,"impactScore":5.5}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-14T16:39:00.556555Z","id":"CVE-2026-54155","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Primary","description":[{"lang":"en","value":"CWE-347"}]}],"references":[{"url":"https://github.com/node-opcua/node-opcua/commit/c6b05738682f5c8d70b1ea275c881f01a1cd9787","source":"security-advisories@github.com"},{"url":"https://github.com/node-opcua/node-opcua/releases/tag/v2.166.0","source":"security-advisories@github.com"},{"url":"https://github.com/node-opcua/node-opcua/security/advisories/GHSA-mq36-523m-x7vv","source":"security-advisories@github.com"}]}