CVE-2026-15690Public exploitNetwork attack vector

Client crash via unchecked empty NamespaceArray response

Published Jul 14, 2026 · Updated Jul 14, 2026

Out-of-bounds read in open62541 1.5.0 through 1.5.5 allows remote attackers to crash OPC UA client applications. responseReadNamespacesArray dereferences results[0] when a successful NamespaceArray response has zero results but uses the non-null empty-array sentinel. Exploitation requires the client to connect to a malicious OPC UA server and complete session setup; demonstrated impact is process termination only.

CVSS severity3.1
Low
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in open62541 1.5.0 through 1.5.5 allows remote attackers to crash OPC UA client applications. responseReadNamespacesArray dereferences results[0] when a successful NamespaceArray response has zero results but uses the non-null empty-array sentinel. Exploitation requires the client to connect to a malicious OPC UA server and complete session setup; demonstrated impact is process termination only.

The record

CVE
CVE-2026-15690
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
o6 Automation GmbH
Product
open62541
Classifications
CWE-476, CWE-404, T1499
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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=1.5.0
  2. Affected versionversion=1.5.1
  3. Affected versionversion=1.5.2
  4. Affected versionversion=1.5.3
  5. Affected versionversion=1.5.4
  6. Affected versionversion=1.5.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

o6 Automation GmbH · open62541version=1.5.0; version=1.5.1; version=1.5.2; version=1.5.3; version=1.5.4; version=1.5.5

Published CVSS scores

1.3VulDBCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
3.1VulDBCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
2.1VulDBAV:N/AC:H/Au:S/C:N/I:N/A:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
CWE-404Improper Resource Shutdown or Release
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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