critical · 9.2

open62541 1.5.0 before 1.5.7 contains an integer overflow in UA_DataType_fromStructureDescription() that wraps the 16-bit memSize field f…

CVE-2026-116014 · GHSA-78c3-xxg6-2pf3 · EUVD-2026-109272 · published 24 Oct 2026

How serious is it

  • Severity: critical, CVSS score 9.2 out of 10.
  • No exploit prediction (EPSS) score yet.
  • Not on the CISA list of exploited vulnerabilities.
  • No public exploit in Exploit-DB.

Is your app affected by CVE-2026-116014?

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Who is affected

  • o6 Automation GmbH Open62541: 1.5.0 <1.5.7

How to check

  1. Find out whether you run the affected product and which version, then compare it with the versions above.

How to fix

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  1. Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
  2. If a vulnerable version was live, check your logs and rotate the secrets that server could read.

The advisory

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.

Check your whole app

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References

Merged from ENISA EUVD. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON

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