CVE-2026-67863

highCVSS 7.5covered by 1 sourcefirst seen 2026-08-05

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.

⚡ Watch CVE-2026-67863

Get an email if CVE-2026-67863 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.

Exploitation outlook

Low exploitation risk0.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all EPSS-scored CVEs.

Advisory coverage (1)

highCVE-2026-67863: In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback pa…nvd · 2026-08-05

External references

NVD record for CVE-2026-67863

CVE.org record

Embed the live status

— this badge updates automatically when the KEV or exploit status changes. How to embed it →

[![CVE-2026-67863 status](https://www.csirts.com/badge/CVE-2026-67863)](https://www.csirts.com/cve/CVE-2026-67863)