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

Critical 9.2 Published 24 Oct 2026 Updated 29 Oct 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-116014?

CVE-2026-116014 is a critical vulnerability in open62541, published on 24 Oct 2026.

Official 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.

Weakness: CWE-190

Which versions are affected by CVE-2026-116014?

How do I fix CVE-2026-116014?

No fix has been published for CVE-2026-116014 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-116014 being exploited?

There is no known exploitation of CVE-2026-116014 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2026-116014, GHSA-78c3-xxg6-2pf3, UBUNTU-CVE-2026-116014.