CVE-2026-67856: Open62541 open62541 vulnerability

Q: What is the severity of CVE-2026-67856?

The severity of CVE-2026-67856 is rated as 29, indicating a significant risk of denial of service.

Q: How do I fix CVE-2026-67856?

To fix CVE-2026-67856, upgrade to open62541 version 1.5.6 or later that addresses this vulnerability.

Q: What impact does CVE-2026-67856 have on systems?

CVE-2026-67856 allows remote attackers to disrupt services, leading to denial of service due to crafted requests.

Q: Which versions of open62541 are affected by CVE-2026-67856?

CVE-2026-67856 affects open62541 v.1.5.5 and earlier versions.

Q: Is there a way to mitigate CVE-2026-67856 without upgrading?

While upgrading is recommended, implementing strict input validation on subscription requests may help mitigate the effects of CVE-2026-67856.

Published Aug 4, 2026

Updated

An issue in open62541 v.1.5.5 and before allows a remote attacker to cause a denial of service via crafted CreateSubscription, CreateMonitoredItems(Sampling), Publish, TransferSubscriptions, and DeleteSubscriptions requests

Affected Software

1 affected component

open62541 open62541<=1.5.5

Event History

Aug 4, 2026

CVE Published

via MITRE·12:00 AM

Data Sourced

via MITRE·12:00 AM

Description

Data Sourced

via NVD·10:17 PM

Description

Frequently Asked Questions

What is the severity of CVE-2026-67856?

The severity of CVE-2026-67856 is rated as 29, indicating a significant risk of denial of service.

How do I fix CVE-2026-67856?

To fix CVE-2026-67856, upgrade to open62541 version 1.5.6 or later that addresses this vulnerability.

What impact does CVE-2026-67856 have on systems?

CVE-2026-67856 allows remote attackers to disrupt services, leading to denial of service due to crafted requests.

Which versions of open62541 are affected by CVE-2026-67856?

CVE-2026-67856 affects open62541 v.1.5.5 and earlier versions.

Is there a way to mitigate CVE-2026-67856 without upgrading?

While upgrading is recommended, implementing strict input validation on subscription requests may help mitigate the effects of CVE-2026-67856.

CVE-2026-67856: Open62541 open62541 vulnerability

Affected Software

Event History

Don't miss critical vulnerabilities

Frequently Asked Questions

What is the severity of CVE-2026-67856?

How do I fix CVE-2026-67856?

What impact does CVE-2026-67856 have on systems?

Which versions of open62541 are affected by CVE-2026-67856?

Is there a way to mitigate CVE-2026-67856 without upgrading?

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Resources

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Frequently Asked Questions

What is the severity of CVE-2026-67856?

How do I fix CVE-2026-67856?

What impact does CVE-2026-67856 have on systems?

Which versions of open62541 are affected by CVE-2026-67856?

Is there a way to mitigate CVE-2026-67856 without upgrading?