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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
n/a n/a affected
Version Status Constraints
n/a affected —

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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/open62541/open62541/blob/v1.5.5/include/open62541/server.h cve-icon
https://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_services_monitoreditem.c cve-icon
https://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_subscription.c cve-icon
https://github.com/open62541/open62541/issues/8131 cve-icon
History

Wed, 05 Aug 2026 23:45:00 +0000

Type Values Removed Values Added
Title Use-After‑Free in open62541 Monitored Item Callback Allows DoS
Weaknesses CWE-416

Wed, 05 Aug 2026 22:45:00 +0000

Type Values Removed Values Added
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.
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-08-05T22:05:42.076Z

Reserved: 2026-07-30T00:00:00.000Z

Link: CVE-2026-67863

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

Updated: 2026-08-05T23:30:04Z

Weaknesses