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CVE-2026-15690— open62541 Shared Client ua_client_connect.c responseReadNamespacesArray null pointer dereference

Quick assessment

Affected
n/a open62541
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.

Open62541是Open62541团队开源的一个 OPC UA(OPC统一架构)的开源实现。 open62541 1.5.5及之前版本存在安全漏洞，该漏洞源于Shared Client Library组件中函数responseReadNamespacesArray对参数Server_NamespaceArray的操作导致空指针取消引用。

CVSS 3.1 · Low EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

VendorProduct Version RangeStatus
n/a open62541 1.5.0 affected
1.5.1 affected
1.5.2 affected
1.5.3 affected
1.5.4 affected
1.5.5 affected
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I. Basic Information for CVE-2026-15690

Vulnerability Information
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Vulnerability Title
open62541 Shared Client ua_client_connect.c responseReadNamespacesArray null pointer dereference
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was identified in open62541 up to 1.5.5. Affected by this issue is the function responseReadNamespacesArray of the file src/client/ua_client_connect.c of the component Shared Client Library. Such manipulation of the argument Server_NamespaceArray leads to null pointer dereference. The attack can be executed remotely. The attack requires a high level of complexity. The exploitation is known to be difficult. The exploit is publicly available and might be used. The project closed the issue report, stating that this is not the official way to report a security vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
open62541 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open62541是Open62541团队开源的一个 OPC UA(OPC统一架构)的开源实现。 open62541 1.5.5及之前版本存在安全漏洞，该漏洞源于Shared Client Library组件中函数responseReadNamespacesArray对参数Server_NamespaceArray的操作导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- open62541 1.5.0 cpe:2.3:a:open62541:open62541:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-15690

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III. Intelligence Information for CVE-2026-15690

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Vendor Advisories for CVE-2026-15690 (1)

Same Patch Batch · n/a · 2026-07-14 · 15 CVEs total

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IV. Related Vulnerabilities

Same product: open62541
Same vendor: n/a
Same weakness: CWE-476

V. Comments for CVE-2026-15690

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