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CVE-2026-54155— node-opcua: Missing nonce verification in UserNameIdentityToken authentication

Quick assessment

Affected
node-opcua node-opcua
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

以下是该漏洞描述的中文翻译： node-opcua 是 TypeScript 和 Node.js 环境下的 OPC UA 实现。在 2.166.0 版本之前，位于 中的 身份验证处理器会对 RSA-OAEP 加密的密码数据块进行解密，但并未验证其末尾字节是否与当前会话的服务器随机数（serverNonce）匹配。未认证的远程攻击者可通过 GetEndpoints 接口获取服务器公钥，并构造一个其小端长度（little-endian length）能产生空密码的数据块，该空密码会被传入 函数，从而危害那些接受空密码的

CVSS 7.7 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
node-opcua node-opcua < 2.166.0 affected
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I. Basic Information for CVE-2026-54155

Vulnerability Information
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Vulnerability Title
node-opcua: Missing nonce verification in UserNameIdentityToken authentication
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
node-opcua node-opcua < 2.166.0 -

II. Public POCs for CVE-2026-54155

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III. Intelligence Information for CVE-2026-54155

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Patches & Fixes for CVE-2026-54155 (1)

Vendor Advisories for CVE-2026-54155 (1)

Vendor Pages for CVE-2026-54155 (1)

IV. Related Vulnerabilities

Same product: node-opcua
Same vendor: node-opcua
Same weakness: CWE-347

V. Comments for CVE-2026-54155

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