High severity8.1NVD Advisory· Published Oct 24, 2026
CVE-2026-116014
CVE-2026-116014
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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Affected products
1Patches
Vulnerability mechanics
References
6- github.com/open62541/open62541/blob/v1.5.6/src/ua_types_definition.cnvd
- github.com/open62541/open62541/commit/0cf4806768c493bc6ccffcd4419da24153b970ecnvd
- github.com/open62541/open62541/pull/8298nvd
- github.com/open62541/open62541/pull/8302nvd
- github.com/open62541/open62541/releases/tag/v1.5.7nvd
- www.vulncheck.com/advisories/open62541-1.5.0-before-1.5.7-integer-overflow-heap-buffer-overflow-via-custom-datatypenvd
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