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CVE-2026-18785— o6 open62541 client_types_custom.c UA_Client_getRemoteDataTypes use after free

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 ca356b088ada7dee824d1b4acd07c1ff07ce242b版本存在安全漏洞，该漏洞源于对examples/custom_datatype/client_types_custom.c文件中UA_Client_getRemoteDataTypes函数的操作，可能导致释放后重用。

CVSS 5.3 · Medium EPSS 0.16% · P4

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 1

VendorProduct Version RangeStatus
o6 open62541 ca356b088ada7dee824d1b4acd07c1ff07ce242b affected
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I. Basic Information for CVE-2026-18785

Vulnerability Information
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Vulnerability Title
o6 open62541 client_types_custom.c UA_Client_getRemoteDataTypes use after free
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was determined in o6 open62541 ca356b088ada7dee824d1b4acd07c1ff07ce242b. Impacted is the function UA_Client_getRemoteDataTypes of the file examples/custom_datatype/client_types_custom.c. Executing a manipulation can lead to use after free. It is possible to launch the attack on the local host. The exploit has been publicly disclosed and may be utilized. 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
释放后使用
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 ca356b088ada7dee824d1b4acd07c1ff07ce242b版本存在安全漏洞，该漏洞源于对examples/custom_datatype/client_types_custom.c文件中UA_Client_getRemoteDataTypes函数的操作，可能导致释放后重用。
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
o6 open62541 ca356b088ada7dee824d1b4acd07c1ff07ce242b cpe:2.3:a:open62541:open62541:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-18785

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III. Intelligence Information for CVE-2026-18785

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Other References for CVE-2026-18785 (2)

IV. Related Vulnerabilities

Same product: open62541
Same vendor: o6
Same weakness: CWE-416

V. Comments for CVE-2026-18785

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