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CVE-2026-116014— open62541 1.5.0 before 1.5.7 Integer Overflow Heap Buffer Overflow via Custom DataType

Quick assessment

Affected
open62541 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 1.5.0 至 1.5.7 版本（不含 1.5.7）中的 函数存在整数溢出漏洞。当处理大型自定义结构定义时，该漏洞会导致 16 位的 字段发生回绕。恶意 OPC UA 服务器可通过 接口提供恶意的数据类型定义，从而触发 中的堆溢出，导致客户端崩溃或实现代码执行。

CVSS 8.1 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
open62541 open62541 1.5.0< 1.5.7 affected
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I. Basic Information for CVE-2026-116014

Vulnerability Information
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Vulnerability Title
open62541 1.5.0 before 1.5.7 Integer Overflow Heap Buffer Overflow via Custom DataType
Source: CVE Program / CVE List V5
Vulnerability Description
open62541 1.5.0 before 1.5.7 contains an integer overflow in UA_DataType_fromStructureDescription() that wraps the 16-bit memSize field for large custom structure definitions. A malicious OPC UA server can supply DataType definitions via UA_Client_getRemoteDataTypes(), causing decodeBinaryStructure() to overflow the heap, crashing clients or enabling code execution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
open62541 open62541 1.5.0 ~ 1.5.7 -

II. Public POCs for CVE-2026-116014

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III. Intelligence Information for CVE-2026-116014

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Patches & Fixes for CVE-2026-116014 (2)

Vendor Advisories for CVE-2026-116014 (1)

Vendor Pages for CVE-2026-116014 (1)

IV. Related Vulnerabilities

Same product: open62541
Same weakness: CWE-190