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CVE-2026-54156— node-opcua: Unbounded nonce cache enables unauthenticated heap exhaustion DoS

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 是面向 TypeScript 和 Node.js 的 OPC UA 实现。在 2.166.0 版本之前， 中由 使用的进程级全局 缓存，会记录来自 和 的非重复值（nonce），但这些记录既没有过期机制，也没有大小限制。未经身份验证的远程攻击者可以通过反复创建带有唯一 nonce 的会话，导致这些条目在会话过期后仍然保留，并随着连接周期的循环不断累积，即使 限制了并发会话数量。由此产生的无界堆内存增长可能导致默认的 Node.js 堆内存耗尽，从而使 node-opcua 服务器进程崩溃。该问

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1291

Affected Version Matrix 1

VendorProduct Version RangeStatus
node-opcua node-opcua < 2.166.0 affected
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I. Basic Information for CVE-2026-54156

Vulnerability Information
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Vulnerability Title
node-opcua: Unbounded nonce cache enables unauthenticated heap exhaustion DoS
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 process-global g_alreadyUsedNonce cache used by nonceAlreadyBeenUsed in packages/node-opcua-secure-channel/source/server/server_secure_channel_layer.ts records nonces from OpenSecureChannelRequest and CreateSession without expiration or a size limit. An unauthenticated remote attacker can repeatedly create sessions with unique nonces, causing entries to persist after session expiry and accumulate across connection cycles even when maxSessions=10 limits concurrent sessions. The resulting unbounded heap growth can exhaust the default Node.js heap and crash the node-opcua server process. This issue is fixed in version 2.166.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
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-2026-54156

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III. Intelligence Information for CVE-2026-54156

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Patches & Fixes for CVE-2026-54156 (1)

Vendor Advisories for CVE-2026-54156 (1)

Vendor Pages for CVE-2026-54156 (1)

IV. Related Vulnerabilities

Same product: node-opcua
Same vendor: node-opcua
Same weakness: CWE-770

V. Comments for CVE-2026-54156

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