open62541 up to 1.5.6 UA_DataType_fromStructureDescription integer overflow

Summaryinfo

A vulnerability categorized as critical has been discovered in open62541 up to 1.5.6. Impacted is the function UA_DataType_fromStructureDescription. Executing a manipulation can lead to integer overflow. This vulnerability is tracked as CVE-2026-116014. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in open62541 up to 1.5.6. It has been declared as critical. This vulnerability affects the function UA_DataType_fromStructureDescription. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-116014 since 10/24/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

Upgrading to version 1.5.7 eliminates this vulnerability.

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Productinfo

Name

• open62541

Version

• 1.5.0
• 1.5.1
• 1.5.2
• 1.5.3
• 1.5.4
• 1.5.5
• 1.5.6

Website

• Product: https://github.com/open62541/open62541/

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