CVE-2026-67863

Published: Aug 5, 2026Modified: Aug 31, 2026Deferred

7.5

Vector

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

Exploitability: 3.9 / Impact: 3.6

Source: MITRE (Secondary)

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.

Related CWEs

CWE-416

Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (5)

https://github.com/open62541/open62541/blob/v1.5.5/include/open62541/server.h

Source: cve@mitre.org

https://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_services_monitoreditem.c

Source: cve@mitre.org

https://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_subscription.c

Source: cve@mitre.org

https://github.com/open62541/open62541/issues/8131

Source: cve@mitre.org

https://github.com/open62541/open62541/issues/8131

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

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