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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.

node-opcua是node-opcua组织的一款实现工业网络设备数据交换与服务器端协议通信的软件开发组件。 node-opcua 2.166.0之前版本存在加密问题漏洞，该漏洞源于packages/node-opcua-server/source/opcua_server.ts中的UserNameIdentityToken身份验证处理程序解密RSA-OAEP密码数据块后未验证尾部字节是否与当前会话serverNonce匹配，可能导致未经身份验证的远程攻击者通过GetEndpoints获取服务器公钥并伪

CVSS 7.7 · High EPSS 0.42% · P37

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
Vulnerability Title
node-opcua 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
node-opcua是node-opcua组织的一款实现工业网络设备数据交换与服务器端协议通信的软件开发组件。 node-opcua 2.166.0之前版本存在加密问题漏洞，该漏洞源于packages/node-opcua-server/source/opcua_server.ts中的UserNameIdentityToken身份验证处理程序解密RSA-OAEP密码数据块后未验证尾部字节是否与当前会话serverNonce匹配，可能导致未经身份验证的远程攻击者通过GetEndpoints获取服务器公钥并伪
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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