CVE-2026-54156
CVE-2026-54156 · node-opcua: Unbounded nonce cache enables unauthenticated heap exhaustion DoS
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 7.5 · High · EPSS 0.8% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
node-opcua
- Versions
- < 2.166.0: Affected
No fix published
node-opcua npm
- Affected ranges
- SEMVER: < 2.166.0
Update to 2.166.0