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.

CVSS 4.0

9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.4% chance of exploitation in the next 30 days; higher than 37% of CVEs (scores of 2026-10-25)

CWE

CWE-190

Published

2026-10-24

Modified

2026-10-24

Record from

the NVD, synced 2026-10-24

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

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