---
title: "CVE-2026-116014: open62541 - Integer Overflow"
description: "open62541 < 1.5.7 contains an integer overflow caused by improper handling of the 16-bit memSize field in UA_DataType_fromStructureDescription(), letting malicious OPC UA servers cause heap overflow and potential code execution, exploit requires interaction with a malicious server."
url: https://panop.io/threat-heartbeat/CVE-2026-116014/
---

# CVE-2026-116014 open62541 - Integer Overflow

open62541 < 1.5.7 contains an integer overflow caused by improper handling of the 16-bit memSize field in UA\_DataType\_fromStructureDescription(), letting malicious OPC UA servers cause heap overflow and potential code execution, exploit requires interaction with a malicious server.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.43% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-116014)

## Details

Type

Integer Overflow

Impact

Remote Code Execution, Denial Of Service

CVSS vector

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

Published

24 October 2026

Updated

26 October 2026

Weakness

[CWE-190](https://cwe.mitre.org/data/definitions/190.html)

## Vendor fix

Upgrade to version 1.5.7 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-116014](https://nvd.nist.gov/vuln/detail/CVE-2026-116014)
- [https://github.com/open62541/open62541/blob/v1.5.6/src/ua\_types\_definition.c#L274](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/commit/0cf4806768c493bc6ccffcd4419da24153b970ec)
- [https://github.com/open62541/open62541/pull/8298](https://github.com/open62541/open62541/pull/8298)
- [https://github.com/open62541/open62541/pull/8302](https://github.com/open62541/open62541/pull/8302)
- [https://github.com/open62541/open62541/releases/tag/v1.5.7](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](https://www.vulncheck.com/advisories/open62541-1.5.0-before-1.5.7-integer-overflow-heap-buffer-overflow-via-custom-datatype)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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