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CVE-2026-67863

7.5 · HIGH

In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path.

Published Aug 5, 2026CWE-416EPSS 0.74%

Overview

CVE-2026-67863 is a high-severity vulnerability. It was published on August 5, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path. The issue occurs when UA_Subscription_localPublish continues to use the current UA_Notification after a callback invokes UA_Server_deleteMonitoredItem for the current local MonitoredItem. This allows a remote attacker to cause a denial of service.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/open62541/open62541/blob/v1.5.5/include/open62541/server.hGitHubgithub.com/open62541/open62541/blob/v1.5.5/src/server/ua_services_monitoreditem.cGitHubgithub.com/open62541/open62541/blob/v1.5.5/src/server/ua_subscription.cGitHubgithub.com/open62541/open62541/issues/8131GitHubgithub.com/open62541/open62541/issues/8131

How CyberStrike helps

Frequently asked questions

What is CVE-2026-67863?

CVE-2026-67863 is a high-severity vulnerability. It was published on August 5, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-67863?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-67863?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-67863?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-67863 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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