Vulnerability GHSA-6wvw-vrw4-363w
Summary
node-opcua: Unbounded nonce cache enables unauthenticated heap exhaustion DoS
Details
Summary A process-global nonce cache with no eviction policy allows an unauthenticated remote attacker to exhaust server heap memory by repeatedly opening sessions, causing the node-opcua server process to crash.
Affected versions: <= 2.165.0 Tested version: 2.165.0 CVSS Score: 7.5 (High) CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CWE: CWE-770 Allocation of Resources Without Limits or Throttling
Measured Impact
Dynamically confirmed heap growth:
- 5,000 unique nonces → +1.23 MB resident heap, no eviction after explicit GC
- Projected: 10^6 nonces → ~246 MB resident heap
- Achievable OOM on default Node.js heap limits
I am following a 90-day responsible disclosure policy. I am happy to provide additional technical details under embargo. Please confirm receipt at your earliest convenience.
Reporter: Stanley Tobias Discovery date: 2026-03-23
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