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Vulnerability record · CVE-2026-67863 · published 5 August 2026

CVE-2026-67863: Use after free vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.74% · top 47.3% CWE-416 · Use after free Deferred
7.5CVSS 3.1 base score
0.74%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
31 Aug 2026Last modified by NVD

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.

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

References

LinkTags
https://github.com/open62541/open62541/blob/v1.5.5/include/open62541/server.h
https://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_services_monitoreditem.c
https://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_subscription.c
https://github.com/open62541/open62541/issues/8131
https://github.com/open62541/open62541/issues/8131

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Source: NIST National Vulnerability Database (record CVE-2026-67863), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.