CVE-2026-54156Network attack vectorHinoki check available

Server crash via unbounded nonce cache

Published Sep 14, 2026 · Updated Sep 14, 2026

Resource exhaustion in Sterfive SAS node-opcua before 2.166.0 allows remote attackers to crash servers via repeated session creation. The process-global g_alreadyUsedNonce object records nonces from OpenSecureChannelRequest and CreateSession without expiration or a size limit. CreateSession requires no certificate, and unique nonces persist across expired sessions until heap exhaustion terminates the Node.js process.

CVSS severity7.5
High
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Resource exhaustion in Sterfive SAS node-opcua before 2.166.0 allows remote attackers to crash servers via repeated session creation. The process-global g_alreadyUsedNonce object records nonces from OpenSecureChannelRequest and CreateSession without expiration or a size limit. CreateSession requires no certificate, and unique nonces persist across expired sessions until heap exhaustion terminates the Node.js process.

The record

CVE
CVE-2026-54156
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
Sterfive SAS
Product
node-opcua
Classifications
CWE-770, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.166.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sterfive SAS · node-opcuaversion=< 2.166.0

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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