VulnerabilityDeferred
CVE-2026-67863
In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path.
HIGH 7.5EPSS 0.40%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.40%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.40% probability · 34th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Source
- cve@mitre.org
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.