{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.166.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "c6b05738682f5c8d70b1ea275c881f01a1cd9787"
            },
            {
              "fixed": "b50d48c0ebd4761670529bf66f39a9c402a07845"
            }
          ],
          "repo": "https://github.com/node-opcua/node-opcua",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-mq36-523m-x7vv"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-347"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54155.json"
  },
  "details": "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.",
  "id": "CVE-2026-54155",
  "modified": "2026-09-16T03:30:22.560059050Z",
  "published": "2026-09-14T16:07:50.461Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/node-opcua/node-opcua/releases/tag/v2.166.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54155.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/node-opcua/node-opcua/security/advisories/GHSA-mq36-523m-x7vv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54155"
    },
    {
      "type": "FIX",
      "url": "https://github.com/node-opcua/node-opcua/commit/c6b05738682f5c8d70b1ea275c881f01a1cd9787"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "node-opcua: Missing nonce verification in UserNameIdentityToken authentication"
}