CVE-2026-116014: Integer Overflow (CVSS 8.1)

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.

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CVSS v3.1 Score

8.1

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-190 Integer Overflow

References

Other References

https://github.com/open62541/open62541/blob/v1.5.6/src/ua_types_definition.c#L274 https://github.com/open62541/open62541/commit/0cf4806768c493bc6ccffcd4419da24153b970ec https://github.com/open62541/open62541/pull/8298 https://github.com/open62541/open62541/pull/8302 https://github.com/open62541/open62541/releases/tag/v1.5.7 https://www.vulncheck.com/advisories/open62541-1.5.0-before-1.5.7-integer-overflow-heap-buffer-overflow-via-custom-datatype

Frequently Asked Questions

What is CVE-2026-116014? +

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. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-116014? +

CVE-2026-116014 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2026-116014? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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