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CVE-2026-95860— node-opcua: Namespace-Level RBAC Fail-Open - Anonymous Write/Call Bypass via Unbound `DefaultRolePermissions

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 是一个面向 TypeScript 和 Node.js 的 OPC UA 实现。在版本 2.42.0 至 2.180.0 期间，通过 配置的命名空间级别访问控制，在运行时执行路径中未被正确应用，具体表现为：对于未显式配置节点级 的节点， 方法读取的是缺失或为 的 元数据值，而非已配置的命名空间字段；该 结果被系统以宽松（允许）的方式处理。因此，匿名网络客户端可以在操作员已配置了限制性命名空间默认权限并依赖权限继承的情况下，写入具有 访问权限的变量，或调用已绑定的方法。未声明策略的服务器、已显式配

CVSS 9.1 · Critical
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I. Basic Information for CVE-2026-95860

Vulnerability Information
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Vulnerability Title
node-opcua: Namespace-Level RBAC Fail-Open - Anonymous Write/Call Bypass via Unbound `DefaultRolePermissions
Source: CVE Program / CVE List V5
Vulnerability Description
node-opcua is an OPC UA implementation for TypeScript and Node.js. From 2.42.0 until 2.180.0, namespace-level access control configured through setDefaultRolePermissions is not honored by the runtime enforcement path for nodes without explicit per-node RolePermissions. SessionContext.getApplicableRolePermissions reads a missing or null DefaultRolePermissions metadata value instead of the configured namespace field, and the null result is treated permissively. An anonymous network client can consequently write variables with CurrentWrite access or call bound methods when an operator configured a restrictive namespace default and relied on inheritance. Servers with no declared policy, nodes with explicit per-node permissions, and correctly bound programmatic namespace metadata are outside the authorization-bypass case. This issue is fixed in version 2.180.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
node-opcua node-opcua >= 2.42.0, < 2.180.0 -

II. Public POCs for CVE-2026-95860

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III. Intelligence Information for CVE-2026-95860

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Other References for CVE-2026-95860 (4)

IV. Related Vulnerabilities

Same product: node-opcua
Same vendor: node-opcua
Same weakness: CWE-285