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CVE-2026-18784— o6 open62541 ua_client_highlevel.c UA_Client_readNodeClassAttribute heap-based overflow

Quick assessment

Affected
o6 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团队开源的一款嵌入式Web服务器中间件。 Open62541 1.5.5及之前版本存在缓冲区错误漏洞，该漏洞源于对src/client/ua_client_highlevel.c文件中的UA_Client_readNodeClassAttribute函数操作不当，可能导致堆缓冲区溢出。

CVSS 5.3 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 6

VendorProduct Version RangeStatus
o6 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-2026-18784

Vulnerability Information
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Vulnerability Title
o6 open62541 ua_client_highlevel.c UA_Client_readNodeClassAttribute heap-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was found in o6 open62541 up to 1.5.5. This issue affects the function UA_Client_readNodeClassAttribute of the file src/client/ua_client_highlevel.c. Performing a manipulation results in heap-based buffer overflow. Attacking locally is a requirement. The exploit has been made public and could 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:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Open62541 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open62541是Open62541团队开源的一款嵌入式Web服务器中间件。 Open62541 1.5.5及之前版本存在缓冲区错误漏洞，该漏洞源于对src/client/ua_client_highlevel.c文件中的UA_Client_readNodeClassAttribute函数操作不当，可能导致堆缓冲区溢出。
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
o6 open62541 1.5.0 cpe:2.3:a:open62541:open62541:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-18784

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III. Intelligence Information for CVE-2026-18784

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Vendor Advisories for CVE-2026-18784 (1)

Proof of Concept for CVE-2026-18784 (1)

IV. Related Vulnerabilities

Same product: open62541
Same vendor: o6
Same weakness: CWE-122

V. Comments for CVE-2026-18784

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